399288132 has 36 divisors (see below), whose sum is σ = 1010400300. Its totient is φ = 132952512.

The previous prime is 399288103. The next prime is 399288133. The reversal of 399288132 is 231882993.

It can be written as a sum of positive squares in 2 ways, for example, as 7485696 + 391802436 = 2736^2 + 19794^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×399288132³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (399288133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30994 + ... + 41942.

It is an arithmetic number, because the mean of its divisors is an integer number (28066675).

Almost surely, 2^399288132 is an apocalyptic number.

It is an amenable number.

399288132 is an abundant number, since it is smaller than the sum of its proper divisors (611112168).

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

399288132 is a wasteful number, since it uses less digits than its factorization.

399288132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11972 (or 11967 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 399288132 is about 19982.1953748831. The cubic root of 399288132 is about 736.3689494899.

The spelling of 399288132 in words is "three hundred ninety-nine million, two hundred eighty-eight thousand, one hundred thirty-two".