39998171540 has 24 divisors (see below), whose sum is σ = 88937111592. Its totient is φ = 15058135040.

The previous prime is 39998171539. The next prime is 39998171579. The reversal of 39998171540 is 4517189993.

It can be written as a sum of positive squares in 4 ways, for example, as 6726952324 + 33271219216 = 82018^2 + 182404^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58820501 + ... + 58821180.

It is an arithmetic number, because the mean of its divisors is an integer number (3705712983).

Almost surely, 2^39998171540 is an apocalyptic number.

It is an amenable number.

39998171540 is an abundant number, since it is smaller than the sum of its proper divisors (48938940052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39998171540 is a wasteful number, since it uses less digits than its factorization.

39998171540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117641707 (or 117641705 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 56.

The spelling of 39998171540 in words is "thirty-nine billion, nine hundred ninety-eight million, one hundred seventy-one thousand, five hundred forty".