399667932 has 72 divisors (see below), whose sum is σ = 1076101936. Its totient is φ = 129610368.

The previous prime is 399667867. The next prime is 399667963. The reversal of 399667932 is 239766993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30408 + ... + 41520.

Almost surely, 2^399667932 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399667932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (538050968).

399667932 is an abundant number, since it is smaller than the sum of its proper divisors (676434004).

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

399667932 is a wasteful number, since it uses less digits than its factorization.

399667932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11169 (or 11155 counting only the distinct ones).

The product of its digits is 3306744, while the sum is 54.

The square root of 399667932 is about 19991.6965763289. The cubic root of 399667932 is about 736.6023517852.

The spelling of 399667932 in words is "three hundred ninety-nine million, six hundred sixty-seven thousand, nine hundred thirty-two".