398544431 has 4 divisors (see below), whose sum is σ = 398615664. Its totient is φ = 398473200.

The previous prime is 398544409. The next prime is 398544451. The reversal of 398544431 is 134445893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398544431 - 2¹⁴ = 398528047 is a prime.

It is a super-2 number, since 2×398544431² = 317675326962227522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398544451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26435 + ... + 38676.

It is an arithmetic number, because the mean of its divisors is an integer number (99653916).

Almost surely, 2^398544431 is an apocalyptic number.

398544431 is a deficient number, since it is larger than the sum of its proper divisors (71233).

398544431 is an equidigital number, since it uses as much as digits as its factorization.

398544431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71232.

The product of its digits is 207360, while the sum is 41.

The square root of 398544431 is about 19963.5776102381. The cubic root of 398544431 is about 735.9114864560.

The spelling of 398544431 in words is "three hundred ninety-eight million, five hundred forty-four thousand, four hundred thirty-one".