399251506290 has 64 divisors (see below), whose sum is σ = 1179327534336. Its totient is φ = 84237679872.

The previous prime is 399251506273. The next prime is 399251506301. The reversal of 399251506290 is 92605152993.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73120257 + ... + 73125716.

It is an arithmetic number, because the mean of its divisors is an integer number (18426992724).

Almost surely, 2^399251506290 is an apocalyptic number.

399251506290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

399251506290 is an abundant number, since it is smaller than the sum of its proper divisors (780076028046).

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

399251506290 is a wasteful number, since it uses less digits than its factorization.

399251506290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146246003.

The product of its (nonzero) digits is 1312200, while the sum is 51.

The spelling of 399251506290 in words is "three hundred ninety-nine billion, two hundred fifty-one million, five hundred six thousand, two hundred ninety".