398651 has 4 divisors (see below), whose sum is σ = 434904. Its totient is φ = 362400.

The previous prime is 398627. The next prime is 398669. The reversal of 398651 is 156893.

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 398651 - 2¹⁴ = 382267 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398611) 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, 18110 + ... + 18131.

It is an arithmetic number, because the mean of its divisors is an integer number (108726).

2³⁹⁸⁶⁵¹ is an apocalyptic number.

398651 is a deficient number, since it is larger than the sum of its proper divisors (36253).

398651 is a wasteful number, since it uses less digits than its factorization.

398651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36252.

The product of its digits is 6480, while the sum is 32.

The square root of 398651 is about 631.3881531990. The cubic root of 398651 is about 73.5977073758.

The spelling of 398651 in words is "three hundred ninety-eight thousand, six hundred fifty-one".