39897856 has 18 divisors (see below), whose sum is σ = 79640372. Its totient is φ = 19948800.

The previous prime is 39897841. The next prime is 39897857. The reversal of 39897856 is 65879893.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 39897797 and 39897806.

It is not an unprimeable number, because it can be changed into a prime (39897857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77670 + ... + 78181.

Almost surely, 2^39897856 is an apocalyptic number.

It is an amenable number.

39897856 is a deficient number, since it is larger than the sum of its proper divisors (39742516).

39897856 is an equidigital number, since it uses as much as digits as its factorization.

39897856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155867 (or 155853 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 55.

The square root of 39897856 is about 6316.4749663083. The cubic root of 39897856 is about 341.7038348884.

The spelling of 39897856 in words is "thirty-nine million, eight hundred ninety-seven thousand, eight hundred fifty-six".