399169800 has 144 divisors (see below), whose sum is σ = 1348180080. Its totient is φ = 105840000.

The previous prime is 399169789. The next prime is 399169811. The reversal of 399169800 is 8961993.

It is an interprime number because it is at equal distance from previous prime (399169789) and next prime (399169811).

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 379275 + ... + 380325.

Almost surely, 2^399169800 is an apocalyptic number.

399169800 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 399169800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674090040).

399169800 is an abundant number, since it is smaller than the sum of its proper divisors (949010280).

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

399169800 is a wasteful number, since it uses less digits than its factorization.

399169800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 399169800 is about 19979.2342195591. The cubic root of 399169800 is about 736.2961995024.

The spelling of 399169800 in words is "three hundred ninety-nine million, one hundred sixty-nine thousand, eight hundred".