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1681394939 = 7240199277
BaseRepresentation
bin110010000111000…
…0000110011111011
311100011211201020122
41210032000303323
511420414114224
6434502043455
756444423030
oct14416006373
94304751218
101681394939
117931159a4
123ab11958b
1320a464063
1411d441387
159c92b15e
hex64380cfb

1681394939 has 4 divisors (see below), whose sum is σ = 1921594224. Its totient is φ = 1441195656.

The previous prime is 1681394929. The next prime is 1681394947. The reversal of 1681394939 is 9394931861.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1681394939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681394929) 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, 120099632 + ... + 120099645.

It is an arithmetic number, because the mean of its divisors is an integer number (480398556).

Almost surely, 21681394939 is an apocalyptic number.

1681394939 is a deficient number, since it is larger than the sum of its proper divisors (240199285).

1681394939 is an equidigital number, since it uses as much as digits as its factorization.

1681394939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240199284.

The product of its digits is 1259712, while the sum is 53.

The square root of 1681394939 is about 41004.8160464109. The cubic root of 1681394939 is about 1189.1133236780.

The spelling of 1681394939 in words is "one billion, six hundred eighty-one million, three hundred ninety-four thousand, nine hundred thirty-nine".

Divisors: 1 7 240199277 1681394939