1398972564 has 72 divisors (see below), whose sum is σ = 3888288768. Its totient is φ = 420577920.

The previous prime is 1398972559. The next prime is 1398972571. The reversal of 1398972564 is 4652798931.

1398972564 is a `hidden beast` number, since 1 + 3 + 9 + 8 + 9 + 72 + 564 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1398972564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36384 + ... + 64200.

Almost surely, 2^1398972564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398972564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944144384).

1398972564 is an abundant number, since it is smaller than the sum of its proper divisors (2489316204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398972564 is a wasteful number, since it uses less digits than its factorization.

1398972564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27965 (or 27960 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 1398972564 is about 37402.8416567512. The cubic root of 1398972564 is about 1118.4152128964.

The spelling of 1398972564 in words is "one billion, three hundred ninety-eight million, nine hundred seventy-two thousand, five hundred sixty-four".