398981620821 has 16 divisors (see below), whose sum is σ = 607991142528. Its totient is φ = 227982316800.

The previous prime is 398981620801. The next prime is 398981620841. The reversal of 398981620821 is 128026189893.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (398981620801) and next prime (398981620841).

It is not a de Polignac number, because 398981620821 - 2⁵ = 398981620789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398981620801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424081 + ... + 988841.

It is an arithmetic number, because the mean of its divisors is an integer number (37999446408).

Almost surely, 2^398981620821 is an apocalyptic number.

It is an amenable number.

398981620821 is a deficient number, since it is larger than the sum of its proper divisors (209009521707).

398981620821 is a wasteful number, since it uses less digits than its factorization.

398981620821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598412.

The product of its (nonzero) digits is 2985984, while the sum is 57.

The spelling of 398981620821 in words is "three hundred ninety-eight billion, nine hundred eighty-one million, six hundred twenty thousand, eight hundred twenty-one".