399403032 has 128 divisors (see below), whose sum is σ = 1220313600. Its totient is φ = 106334208.

The previous prime is 399403031. The next prime is 399403033. The reversal of 399403032 is 230304993.

It is an interprime number because it is at equal distance from previous prime (399403031) and next prime (399403033).

It is a junction number, because it is equal to n+sod(n) for n = 399402984 and 399403002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399403031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310663 + ... + 311945.

It is an arithmetic number, because the mean of its divisors is an integer number (9533700).

Almost surely, 2^399403032 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 399403032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (610156800).

399403032 is an abundant number, since it is smaller than the sum of its proper divisors (820910568).

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

399403032 is a wasteful number, since it uses less digits than its factorization.

399403032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425 (or 1421 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 33.

The square root of 399403032 is about 19985.0702275474. The cubic root of 399403032 is about 736.4395757462.

The spelling of 399403032 in words is "three hundred ninety-nine million, four hundred three thousand, thirty-two".