39999970 has 16 divisors (see below), whose sum is σ = 72097848. Its totient is φ = 15978240.

The previous prime is 39999943. The next prime is 39999979. The reversal of 39999970 is 7999993.

It can be written as a sum of positive squares in 4 ways, for example, as 35058241 + 4941729 = 5921^2 + 2223^2 .

It is not an unprimeable number, because it can be changed into a prime (39999979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6490 + ... + 11050.

Almost surely, 2^39999970 is an apocalyptic number.

39999970 is a deficient number, since it is larger than the sum of its proper divisors (32097878).

39999970 is a wasteful number, since it uses less digits than its factorization.

39999970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5445.

The product of its (nonzero) digits is 1240029, while the sum is 55.

The square root of 39999970 is about 6324.5529486281. The cubic root of 39999970 is about 341.9951038365.

The spelling of 39999970 in words is "thirty-nine million, nine hundred ninety-nine thousand, nine hundred seventy".