39945970 has 8 divisors (see below), whose sum is σ = 71902764. Its totient is φ = 15978384.

The previous prime is 39945967. The next prime is 39945973. The reversal of 39945970 is 7954993.

It is an interprime number because it is at equal distance from previous prime (39945967) and next prime (39945973).

It can be written as a sum of positive squares in 2 ways, for example, as 39225169 + 720801 = 6263^2 + 849^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 39945970.

It is not an unprimeable number, because it can be changed into a prime (39945973) 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, 1997289 + ... + 1997308.

Almost surely, 2^39945970 is an apocalyptic number.

39945970 is a deficient number, since it is larger than the sum of its proper divisors (31956794).

39945970 is a wasteful number, since it uses less digits than its factorization.

39945970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994604.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 39945970 is about 6320.2824303982. The cubic root of 39945970 is about 341.8411366183.

The spelling of 39945970 in words is "thirty-nine million, nine hundred forty-five thousand, nine hundred seventy".