39966215 has 16 divisors (see below), whose sum is σ = 51563520. Its totient is φ = 29642400.

The previous prime is 39966211. The next prime is 39966229. The reversal of 39966215 is 51266993.

It is not a de Polignac number, because 39966215 - 2² = 39966211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39966211) 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, 11 + ... + 8940.

It is an arithmetic number, because the mean of its divisors is an integer number (3222720).

Almost surely, 2^39966215 is an apocalyptic number.

39966215 is a deficient number, since it is larger than the sum of its proper divisors (11597305).

39966215 is a wasteful number, since it uses less digits than its factorization.

39966215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9022.

The product of its digits is 87480, while the sum is 41.

The square root of 39966215 is about 6321.8838173443. The cubic root of 39966215 is about 341.8988763185.

The spelling of 39966215 in words is "thirty-nine million, nine hundred sixty-six thousand, two hundred fifteen".