398837058921 has 16 divisors (see below), whose sum is σ = 675279676800. Its totient is φ = 227906890704.

The previous prime is 398837058881. The next prime is 398837058953. The reversal of 398837058921 is 129850738893.

398837058921 is a `hidden beast` number, since 398 + 83 + 70 + 5 + 89 + 21 = 666.

It is not a de Polignac number, because 398837058921 - 2¹⁰ = 398837057897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (398837058121) 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, 1055124306 + ... + 1055124683.

It is an arithmetic number, because the mean of its divisors is an integer number (42204979800).

Almost surely, 2^398837058921 is an apocalyptic number.

It is an amenable number.

398837058921 is a deficient number, since it is larger than the sum of its proper divisors (276442617879).

398837058921 is a wasteful number, since it uses less digits than its factorization.

398837058921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110249005 (or 2110248999 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 398837058921 in words is "three hundred ninety-eight billion, eight hundred thirty-seven million, fifty-eight thousand, nine hundred twenty-one".