398231651 has 4 divisors (see below), whose sum is σ = 404981400. Its totient is φ = 391481904.

The previous prime is 398231627. The next prime is 398231663. The reversal of 398231651 is 156132893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156132893 = 7 ⋅22304699.

It is a cyclic number.

It is not a de Polignac number, because 398231651 - 2¹⁴ = 398215267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398231671) 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, 3374786 + ... + 3374903.

It is an arithmetic number, because the mean of its divisors is an integer number (101245350).

Almost surely, 2^398231651 is an apocalyptic number.

398231651 is a deficient number, since it is larger than the sum of its proper divisors (6749749).

398231651 is an equidigital number, since it uses as much as digits as its factorization.

398231651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6749748.

The product of its digits is 38880, while the sum is 38.

The square root of 398231651 is about 19955.7423064140. The cubic root of 398231651 is about 735.7189201922.

The spelling of 398231651 in words is "three hundred ninety-eight million, two hundred thirty-one thousand, six hundred fifty-one".