399532500 has 150 divisors (see below), whose sum is σ = 1305814818. Its totient is φ = 106488000.

The previous prime is 399532459. The next prime is 399532541. The reversal of 399532500 is 5235993.

399532500 is a `hidden beast` number, since 39 + 95 + 32 + 500 = 666.

It is an interprime number because it is at equal distance from previous prime (399532459) and next prime (399532541).

It can be written as a sum of positive squares in 5 ways, for example, as 216796176 + 182736324 = 14724^2 + 13518^2 .

It is a tau number, because it is divible by the number of its divisors (150).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 201514 + ... + 203486.

Almost surely, 2^399532500 is an apocalyptic number.

399532500 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399532500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (652907409).

399532500 is an abundant number, since it is smaller than the sum of its proper divisors (906282318).

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

399532500 is a wasteful number, since it uses less digits than its factorization.

399532500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009 (or 1983 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 36.

The square root of 399532500 is about 19988.3090830615. The cubic root of 399532500 is about 736.5191403722.

The spelling of 399532500 in words is "three hundred ninety-nine million, five hundred thirty-two thousand, five hundred".