398049551481 has 16 divisors (see below), whose sum is σ = 538967157120. Its totient is φ = 261259703040.

The previous prime is 398049551411. The next prime is 398049551489. The reversal of 398049551481 is 184155940893.

It is a happy number.

It is not a de Polignac number, because 398049551481 - 2³¹ = 395902067833 is a prime.

It is a super-2 number, since 2×398049551481² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (398049551489) 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, 1166880 + ... + 1468913.

It is an arithmetic number, because the mean of its divisors is an integer number (33685447320).

Almost surely, 2^398049551481 is an apocalyptic number.

It is an amenable number.

398049551481 is a deficient number, since it is larger than the sum of its proper divisors (140917605639).

398049551481 is a wasteful number, since it uses less digits than its factorization.

398049551481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636576.

The product of its (nonzero) digits is 6220800, while the sum is 57.

The spelling of 398049551481 in words is "three hundred ninety-eight billion, forty-nine million, five hundred fifty-one thousand, four hundred eighty-one".