10139897 has 4 divisors (see below), whose sum is σ = 10208100. Its totient is φ = 10071696.

The previous prime is 10139881. The next prime is 10139923. The reversal of 10139897 is 79893101.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1590121 + 8549776 = 1261^2 + 2924^2 .

It is a cyclic number.

It is not a de Polignac number, because 10139897 - 2⁴ = 10139881 is a prime.

It is a super-2 number, since 2×10139897² = 205635022341218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10139897.

It is not an unprimeable number, because it can be changed into a prime (10139867) 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, 33878 + ... + 34175.

It is an arithmetic number, because the mean of its divisors is an integer number (2552025).

Almost surely, 2^10139897 is an apocalyptic number.

It is an amenable number.

10139897 is a deficient number, since it is larger than the sum of its proper divisors (68203).

10139897 is an equidigital number, since it uses as much as digits as its factorization.

10139897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68202.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 10139897 is about 3184.3204926640. The cubic root of 10139897 is about 216.4434832663.

The spelling of 10139897 in words is "ten million, one hundred thirty-nine thousand, eight hundred ninety-seven".