39642981 has 16 divisors (see below), whose sum is σ = 60499968. Its totient is φ = 22618800.

The previous prime is 39642979. The next prime is 39642983. The reversal of 39642981 is 18924693.

It is an interprime number because it is at equal distance from previous prime (39642979) and next prime (39642983).

It is not a de Polignac number, because 39642981 - 2¹ = 39642979 is a prime.

It is a super-2 number, since 2×39642981² = 3143131885132722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39642983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20736 + ... + 22566.

It is an arithmetic number, because the mean of its divisors is an integer number (3781248).

Almost surely, 2^39642981 is an apocalyptic number.

It is an amenable number.

39642981 is a deficient number, since it is larger than the sum of its proper divisors (20856987).

39642981 is a wasteful number, since it uses less digits than its factorization.

39642981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872.

The product of its digits is 93312, while the sum is 42.

The square root of 39642981 is about 6296.2672274928. The cubic root of 39642981 is about 340.9746572039.

The spelling of 39642981 in words is "thirty-nine million, six hundred forty-two thousand, nine hundred eighty-one".