398950223581 has 32 divisors (see below), whose sum is σ = 507532476416. Its totient is φ = 305062200000.

The previous prime is 398950223521. The next prime is 398950223593. The reversal of 398950223581 is 185322059893.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 398950223581 - 2¹⁵ = 398950190813 is a prime.

It is a super-2 number, since 2×398950223581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398950223521) 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, 2024416 + ... + 2212726.

It is an arithmetic number, because the mean of its divisors is an integer number (15860389888).

Almost surely, 2^398950223581 is an apocalyptic number.

398950223581 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

398950223581 is a deficient number, since it is larger than the sum of its proper divisors (108582252835).

398950223581 is a wasteful number, since it uses less digits than its factorization.

398950223581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189113.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 398950223581 in words is "three hundred ninety-eight billion, nine hundred fifty million, two hundred twenty-three thousand, five hundred eighty-one".