398523421 has 8 divisors (see below), whose sum is σ = 403903584. Its totient is φ = 393157200.

The previous prime is 398523409. The next prime is 398523439. The reversal of 398523421 is 124325893.

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

It is a cyclic number.

It is not a de Polignac number, because 398523421 - 2²³ = 390134813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398523121) 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, 62271 + ... + 68371.

It is an arithmetic number, because the mean of its divisors is an integer number (50487948).

Almost surely, 2^398523421 is an apocalyptic number.

It is an amenable number.

398523421 is a deficient number, since it is larger than the sum of its proper divisors (5380163).

398523421 is an equidigital number, since it uses as much as digits as its factorization.

398523421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6971.

The product of its digits is 51840, while the sum is 37.

The square root of 398523421 is about 19963.0513950147. The cubic root of 398523421 is about 735.8985545879.

The spelling of 398523421 in words is "three hundred ninety-eight million, five hundred twenty-three thousand, four hundred twenty-one".