399220092 has 36 divisors (see below), whose sum is σ = 1009828456. Its totient is φ = 132982560.

The previous prime is 399220079. The next prime is 399220097. The reversal of 399220092 is 290022993.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399220097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68742 + ... + 74322.

Almost surely, 2^399220092 is an apocalyptic number.

It is an amenable number.

399220092 is an abundant number, since it is smaller than the sum of its proper divisors (610608364).

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

399220092 is a wasteful number, since it uses less digits than its factorization.

399220092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7578 (or 7573 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 399220092 is about 19980.4927867157. The cubic root of 399220092 is about 736.3271205569.

The spelling of 399220092 in words is "three hundred ninety-nine million, two hundred twenty thousand, ninety-two".