39129730 has 8 divisors (see below), whose sum is σ = 70433532. Its totient is φ = 15651888.

The previous prime is 39129707. The next prime is 39129737. The reversal of 39129730 is 3792193.

It can be written as a sum of positive squares in 2 ways, for example, as 38452401 + 677329 = 6201^2 + 823^2 .

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

It is a super-2 number, since 2×39129730² = 3062271539745800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39129737) 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, 1956477 + ... + 1956496.

Almost surely, 2^39129730 is an apocalyptic number.

39129730 is a deficient number, since it is larger than the sum of its proper divisors (31303802).

39129730 is a wasteful number, since it uses less digits than its factorization.

39129730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912980.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 39129730 is about 6255.3760878144. The cubic root of 39129730 is about 339.4967468236.

The spelling of 39129730 in words is "thirty-nine million, one hundred twenty-nine thousand, seven hundred thirty".