399694500 has 240 divisors, whose sum is σ = 1331890560. Its totient is φ = 104328000.

The previous prime is 399694499. The next prime is 399694511. The reversal of 399694500 is 5496993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2875431 + ... + 2875569.

It is an arithmetic number, because the mean of its divisors is an integer number (5549544).

Almost surely, 2^399694500 is an apocalyptic number.

399694500 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 399694500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665945280).

399694500 is an abundant number, since it is smaller than the sum of its proper divisors (932196060).

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

399694500 is a wasteful number, since it uses less digits than its factorization.

399694500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 399694500 is about 19992.3610411577. The cubic root of 399694500 is about 736.6186733496.

The spelling of 399694500 in words is "three hundred ninety-nine million, six hundred ninety-four thousand, five hundred".