399126540 has 48 divisors (see below), whose sum is σ = 1176376320. Its totient is φ = 100831680.

The previous prime is 399126529. The next prime is 399126557. The reversal of 399126540 is 45621993.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173916 + ... + 176195.

It is an arithmetic number, because the mean of its divisors is an integer number (24507840).

Almost surely, 2^399126540 is an apocalyptic number.

399126540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399126540 is an abundant number, since it is smaller than the sum of its proper divisors (777249780).

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

399126540 is a wasteful number, since it uses less digits than its factorization.

399126540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350142 (or 350140 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 399126540 is about 19978.1515661485. The cubic root of 399126540 is about 736.2695998579.

The spelling of 399126540 in words is "three hundred ninety-nine million, one hundred twenty-six thousand, five hundred forty".