39678157 has 4 divisors (see below), whose sum is σ = 39690976. Its totient is φ = 39665340.

The previous prime is 39678131. The next prime is 39678161. The reversal of 39678157 is 75187693.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39678157 is a prime.

It is a super-2 number, since 2×39678157² = 3148712285833298, which 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 (39678127) 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, 1432 + ... + 9022.

It is an arithmetic number, because the mean of its divisors is an integer number (9922744).

Almost surely, 2^39678157 is an apocalyptic number.

It is an amenable number.

39678157 is a deficient number, since it is larger than the sum of its proper divisors (12819).

39678157 is an equidigital number, since it uses as much as digits as its factorization.

39678157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12818.

The product of its digits is 317520, while the sum is 46.

The square root of 39678157 is about 6299.0600092395. The cubic root of 39678157 is about 341.0754785721.

The spelling of 39678157 in words is "thirty-nine million, six hundred seventy-eight thousand, one hundred fifty-seven".