39897642 has 16 divisors (see below), whose sum is σ = 81493632. Its totient is φ = 13016160.

The previous prime is 39897631. The next prime is 39897643. The reversal of 39897642 is 24679893.

It is a junction number, because it is equal to n+sod(n) for n = 39897591 and 39897600.

It is not an unprimeable number, because it can be changed into a prime (39897643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70459 + ... + 71022.

It is an arithmetic number, because the mean of its divisors is an integer number (5093352).

Almost surely, 2^39897642 is an apocalyptic number.

39897642 is an abundant number, since it is smaller than the sum of its proper divisors (41595990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39897642 is a wasteful number, since it uses less digits than its factorization.

39897642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141533.

The product of its digits is 653184, while the sum is 48.

The square root of 39897642 is about 6316.4580264575. The cubic root of 39897642 is about 341.7032239554.

The spelling of 39897642 in words is "thirty-nine million, eight hundred ninety-seven thousand, six hundred forty-two".