398936890 has 32 divisors (see below), whose sum is σ = 786542400. Its totient is φ = 144480000.

The previous prime is 398936831. The next prime is 398936891. The reversal of 398936890 is 98639893.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (398936891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20386 + ... + 34834.

It is an arithmetic number, because the mean of its divisors is an integer number (24579450).

Almost surely, 2^398936890 is an apocalyptic number.

398936890 is a deficient number, since it is larger than the sum of its proper divisors (387605510).

398936890 is a wasteful number, since it uses less digits than its factorization.

398936890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14718.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 398936890 is about 19973.4045670737. The cubic root of 398936890 is about 736.1529654595.

The spelling of 398936890 in words is "three hundred ninety-eight million, nine hundred thirty-six thousand, eight hundred ninety".