39928437397 has 4 divisors (see below), whose sum is σ = 39974705280. Its totient is φ = 39882169516.

The previous prime is 39928437383. The next prime is 39928437403. The reversal of 39928437397 is 79373482993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39928437397 - 2²³ = 39920048789 is a prime.

It is a super-2 number, since 2×39928437397² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39928437097) 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, 23132647 + ... + 23134372.

It is an arithmetic number, because the mean of its divisors is an integer number (9993676320).

Almost surely, 2^39928437397 is an apocalyptic number.

It is an amenable number.

39928437397 is a deficient number, since it is larger than the sum of its proper divisors (46267883).

39928437397 is an equidigital number, since it uses as much as digits as its factorization.

39928437397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46267882.

The product of its digits is 61725888, while the sum is 64.

The spelling of 39928437397 in words is "thirty-nine billion, nine hundred twenty-eight million, four hundred thirty-seven thousand, three hundred ninety-seven".