39724292138 has 8 divisors (see below), whose sum is σ = 60710710788. Its totient is φ = 19487388544.

The previous prime is 39724292099. The next prime is 39724292227. The reversal of 39724292138 is 83129242793.

It can be written as a sum of positive squares in 2 ways, for example, as 39197268289 + 527023849 = 197983^2 + 22957^2 .

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

It is a super-2 number, since 2×39724292138² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187378631 + ... + 187378842.

Almost surely, 2^39724292138 is an apocalyptic number.

39724292138 is a deficient number, since it is larger than the sum of its proper divisors (20986418650).

39724292138 is a wasteful number, since it uses less digits than its factorization.

39724292138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374757528.

The product of its digits is 1306368, while the sum is 50.

The spelling of 39724292138 in words is "thirty-nine billion, seven hundred twenty-four million, two hundred ninety-two thousand, one hundred thirty-eight".