398537465 has 4 divisors (see below), whose sum is σ = 478244964. Its totient is φ = 318829968.

The previous prime is 398537453. The next prime is 398537467. The reversal of 398537465 is 564735893.

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

It can be written as a sum of positive squares in 2 ways, for example, as 254849296 + 143688169 = 15964^2 + 11987^2 .

It is a cyclic number.

It is not a de Polignac number, because 398537465 - 2¹⁶ = 398471929 is a prime.

It is a super-2 number, since 2×398537465² = 317664222017252450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398537467) 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, 39853742 + ... + 39853751.

It is an arithmetic number, because the mean of its divisors is an integer number (119561241).

Almost surely, 2^398537465 is an apocalyptic number.

It is an amenable number.

398537465 is a deficient number, since it is larger than the sum of its proper divisors (79707499).

398537465 is an equidigital number, since it uses as much as digits as its factorization.

398537465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79707498.

The product of its digits is 2721600, while the sum is 50.

The square root of 398537465 is about 19963.4031417492. The cubic root of 398537465 is about 735.9071988627.

The spelling of 398537465 in words is "three hundred ninety-eight million, five hundred thirty-seven thousand, four hundred sixty-five".