398216231 has 32 divisors (see below), whose sum is σ = 496204800. Its totient is φ = 311973120.

The previous prime is 398216201. The next prime is 398216251. The reversal of 398216231 is 132612893.

It is a cyclic number.

It is not a de Polignac number, because 398216231 - 2¹⁴ = 398199847 is a prime.

It is a super-2 number, since 2×398216231² = 317152333263690722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 398216191 and 398216200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398216201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 561305 + ... + 562013.

It is an arithmetic number, because the mean of its divisors is an integer number (15506400).

Almost surely, 2^398216231 is an apocalyptic number.

398216231 is a deficient number, since it is larger than the sum of its proper divisors (97988569).

398216231 is a wasteful number, since it uses less digits than its factorization.

398216231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879.

The product of its digits is 15552, while the sum is 35.

The square root of 398216231 is about 19955.3559477149. The cubic root of 398216231 is about 735.7094241010.

The spelling of 398216231 in words is "three hundred ninety-eight million, two hundred sixteen thousand, two hundred thirty-one".