399991260 has 48 divisors (see below), whose sum is σ = 1122482592. Its totient is φ = 106425600.

The previous prime is 399991247. The next prime is 399991261. The reversal of 399991260 is 62199993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399991261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20430 + ... + 34890.

It is an arithmetic number, because the mean of its divisors is an integer number (23385054).

Almost surely, 2^399991260 is an apocalyptic number.

399991260 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399991260 is an abundant number, since it is smaller than the sum of its proper divisors (722491332).

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

399991260 is a wasteful number, since it uses less digits than its factorization.

399991260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14934 (or 14932 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 48.

The square root of 399991260 is about 19999.7814988064. The cubic root of 399991260 is about 736.8009332831.

It can be divided in two parts, 3999 and 91260, that added together give a palindrome (95259).

The spelling of 399991260 in words is "three hundred ninety-nine million, nine hundred ninety-one thousand, two hundred sixty".