39897081 has 12 divisors (see below), whose sum is σ = 65861952. Its totient is φ = 22798296.

The previous prime is 39897061. The next prime is 39897083. The reversal of 39897081 is 18079893.

It is not a de Polignac number, because 39897081 - 2¹⁴ = 39880697 is a prime.

It is a super-2 number, since 2×39897081² = 3183554144641122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39897083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 316581 + ... + 316706.

It is an arithmetic number, because the mean of its divisors is an integer number (5488496).

Almost surely, 2^39897081 is an apocalyptic number.

It is an amenable number.

39897081 is a deficient number, since it is larger than the sum of its proper divisors (25964871).

39897081 is a wasteful number, since it uses less digits than its factorization.

39897081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633300 (or 633297 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 39897081 is about 6316.4136185022. The cubic root of 39897081 is about 341.7016223870.

It can be divided in two parts, 398 and 97081, that added together give a palindrome (97479).

The spelling of 39897081 in words is "thirty-nine million, eight hundred ninety-seven thousand, eighty-one".