399279090 has 32 divisors (see below), whose sum is σ = 1095166080. Its totient is φ = 91263744.

The previous prime is 399279061. The next prime is 399279107. The reversal of 399279090 is 90972993.

It is a happy number.

It is a super-2 number, since 2×399279090² = 318847583422456200, which contains 22 as substring.

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, 950455 + ... + 950874.

It is an arithmetic number, because the mean of its divisors is an integer number (34223940).

Almost surely, 2^399279090 is an apocalyptic number.

399279090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

399279090 is an abundant number, since it is smaller than the sum of its proper divisors (695886990).

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

399279090 is a wasteful number, since it uses less digits than its factorization.

399279090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901346.

The product of its (nonzero) digits is 275562, while the sum is 48.

The square root of 399279090 is about 19981.9691221861. The cubic root of 399279090 is about 736.3633910157.

The spelling of 399279090 in words is "three hundred ninety-nine million, two hundred seventy-nine thousand, ninety".