39971145 has 16 divisors (see below), whose sum is σ = 64196352. Its totient is φ = 21237120.

The previous prime is 39971119. The next prime is 39971149. The reversal of 39971145 is 54117993.

It is a happy number.

It is not a de Polignac number, because 39971145 - 2⁷ = 39971017 is a prime.

It is a super-2 number, since 2×39971145² = 3195384865222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39971149) 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, 852 + ... + 8981.

It is an arithmetic number, because the mean of its divisors is an integer number (4012272).

Almost surely, 2^39971145 is an apocalyptic number.

It is an amenable number.

39971145 is a deficient number, since it is larger than the sum of its proper divisors (24225207).

39971145 is a wasteful number, since it uses less digits than its factorization.

39971145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10112.

The product of its digits is 34020, while the sum is 39.

The square root of 39971145 is about 6322.2737207432. The cubic root of 39971145 is about 341.9129339599.

The spelling of 39971145 in words is "thirty-nine million, nine hundred seventy-one thousand, one hundred forty-five".