39971380 has 12 divisors (see below), whose sum is σ = 83939940. Its totient is φ = 15988544.

The previous prime is 39971363. The next prime is 39971387. The reversal of 39971380 is 8317993.

It can be written as a sum of positive squares in 2 ways, for example, as 12702096 + 27269284 = 3564^2 + 5222^2 .

It is a super-2 number, since 2×39971380² = 3195422438208800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39971387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999265 + ... + 999304.

It is an arithmetic number, because the mean of its divisors is an integer number (6994995).

Almost surely, 2^39971380 is an apocalyptic number.

It is an amenable number.

39971380 is an abundant number, since it is smaller than the sum of its proper divisors (43968560).

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

39971380 is a wasteful number, since it uses less digits than its factorization.

39971380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998578 (or 1998576 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 39971380 is about 6322.2923058017. The cubic root of 39971380 is about 341.9136040215.

The spelling of 39971380 in words is "thirty-nine million, nine hundred seventy-one thousand, three hundred eighty".