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194389903 = 985919717
BaseRepresentation
bin10111001011000…
…10011110001111
3111112210000211001
423211202132033
5344230434103
631142241131
74550200261
oct1345423617
9445700731
10194389903
119a801014
12551261a7
1331371916
141bb61b31
15120ec01d
hexb96278f

194389903 has 4 divisors (see below), whose sum is σ = 194419480. Its totient is φ = 194360328.

The previous prime is 194389889. The next prime is 194389919. The reversal of 194389903 is 309983491.

194389903 is a nontrivial binomial coefficient, being equal to C(19718, 2).

It is a semiprime because it is the product of two primes.

It is a 3-Lehmer number, since φ(194389903) divides (194389903-1)3.

It is a cyclic number.

It is not a de Polignac number, because 194389903 - 213 = 194381711 is a prime.

It is a deceptive number, since it divides R194389902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194389103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 19717.

It is an arithmetic number, because the mean of its divisors is an integer number (48604870).

Almost surely, 2194389903 is an apocalyptic number.

194389903 is the 19717-th triangular number and also the 9859-th hexagonal number.

194389903 is the 6573-rd centered nonagonal number.

194389903 is a deficient number, since it is larger than the sum of its proper divisors (29577).

194389903 is an equidigital number, since it uses as much as digits as its factorization.

194389903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29576.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 194389903 is about 13942.3779535630. The cubic root of 194389903 is about 579.2836012211.

The spelling of 194389903 in words is "one hundred ninety-four million, three hundred eighty-nine thousand, nine hundred three".

Divisors: 1 9859 19717 194389903