398354990 has 48 divisors (see below), whose sum is σ = 793274256. Its totient is φ = 144019040.

The previous prime is 398354977. The next prime is 398354993. The reversal of 398354990 is 99453893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398354993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2302544 + ... + 2302716.

It is an arithmetic number, because the mean of its divisors is an integer number (16526547).

Almost surely, 2^398354990 is an apocalyptic number.

398354990 is a deficient number, since it is larger than the sum of its proper divisors (394919266).

398354990 is an equidigital number, since it uses as much as digits as its factorization.

398354990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 398354990 is about 19958.8323806780. The cubic root of 398354990 is about 735.7948671685.

The spelling of 398354990 in words is "three hundred ninety-eight million, three hundred fifty-four thousand, nine hundred ninety".