398754497650 has 24 divisors (see below), whose sum is σ = 742008734964. Its totient is φ = 159431827200.

The previous prime is 398754497629. The next prime is 398754497677. The reversal of 398754497650 is 56794457893.

It can be written as a sum of positive squares in 6 ways, for example, as 297571341001 + 101183156649 = 545501^2 + 318093^2 .

It is a super-2 number, since 2×398754497650² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1634107 + ... + 1862206.

Almost surely, 2^398754497650 is an apocalyptic number.

398754497650 is a deficient number, since it is larger than the sum of its proper divisors (343254237314).

398754497650 is a wasteful number, since it uses less digits than its factorization.

398754497650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498606 (or 3498601 counting only the distinct ones).

The product of its (nonzero) digits is 228614400, while the sum is 67.

The spelling of 398754497650 in words is "three hundred ninety-eight billion, seven hundred fifty-four million, four hundred ninety-seven thousand, six hundred fifty".