39972861 has 12 divisors (see below), whose sum is σ = 58074588. Its totient is φ = 26493504.

The previous prime is 39972859. The next prime is 39972887. The reversal of 39972861 is 16827993.

It can be written as a sum of positive squares in 2 ways, for example, as 35176761 + 4796100 = 5931^2 + 2190^2 .

It is not a de Polignac number, because 39972861 - 2¹ = 39972859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39972811) 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, 11280 + ... + 14393.

It is an arithmetic number, because the mean of its divisors is an integer number (4839549).

Almost surely, 2^39972861 is an apocalyptic number.

It is an amenable number.

39972861 is a deficient number, since it is larger than the sum of its proper divisors (18101727).

39972861 is a wasteful number, since it uses less digits than its factorization.

39972861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25852 (or 25849 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 39972861 is about 6322.4094299563. The cubic root of 39972861 is about 341.9178267745.

The spelling of 39972861 in words is "thirty-nine million, nine hundred seventy-two thousand, eight hundred sixty-one".