398401923 has 8 divisors (see below), whose sum is σ = 543556288. Its totient is φ = 259424424.

The previous prime is 398401907. The next prime is 398401933. The reversal of 398401923 is 329104893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398401923 - 2⁴ = 398401907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398401933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1544065 + ... + 1544322.

It is an arithmetic number, because the mean of its divisors is an integer number (67944536).

Almost surely, 2^398401923 is an apocalyptic number.

398401923 is a deficient number, since it is larger than the sum of its proper divisors (145154365).

398401923 is a wasteful number, since it uses less digits than its factorization.

398401923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088433.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 398401923 is about 19960.0080911807. The cubic root of 398401923 is about 735.8237624213.

The spelling of 398401923 in words is "three hundred ninety-eight million, four hundred one thousand, nine hundred twenty-three".