39970215 has 24 divisors (see below), whose sum is σ = 70593120. Its totient is φ = 20913984.

The previous prime is 39970211. The next prime is 39970219. The reversal of 39970215 is 51207993.

It is an interprime number because it is at equal distance from previous prime (39970211) and next prime (39970219).

It is not a de Polignac number, because 39970215 - 2² = 39970211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39970215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39970211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5995 + ... + 10764.

It is an arithmetic number, because the mean of its divisors is an integer number (2941380).

Almost surely, 2^39970215 is an apocalyptic number.

39970215 is a deficient number, since it is larger than the sum of its proper divisors (30622905).

39970215 is a wasteful number, since it uses less digits than its factorization.

39970215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16823 (or 16820 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 39970215 is about 6322.2001708266. The cubic root of 39970215 is about 341.9102822012.

The spelling of 39970215 in words is "thirty-nine million, nine hundred seventy thousand, two hundred fifteen".