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19195397 = 131786857
BaseRepresentation
bin100100100111…
…0011000000101
31100010020010122
41021032120011
514403223042
61523231325
7322105154
oct111163005
940106118
1019195397
11a920871
126518545
133c91130
14279959b
151a427d2
hex124e605

19195397 has 8 divisors (see below), whose sum is σ = 21888216. Its totient is φ = 16676352.

The previous prime is 19195387. The next prime is 19195403. The reversal of 19195397 is 79359191.

It can be written as a sum of positive squares in 4 ways, for example, as 1437601 + 17757796 = 1199^2 + 4214^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19195397 - 216 = 19129861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19195357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43208 + ... + 43649.

It is an arithmetic number, because the mean of its divisors is an integer number (2736027).

Almost surely, 219195397 is an apocalyptic number.

19195397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19195397 is a deficient number, since it is larger than the sum of its proper divisors (2692819).

19195397 is a wasteful number, since it uses less digits than its factorization.

19195397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86887.

The product of its digits is 76545, while the sum is 44.

The square root of 19195397 is about 4381.2551854463. The cubic root of 19195397 is about 267.7517797124.

The spelling of 19195397 in words is "nineteen million, one hundred ninety-five thousand, three hundred ninety-seven".

Divisors: 1 13 17 221 86857 1129141 1476569 19195397