990001457972 has 6 divisors (see below), whose sum is σ = 1732502551458. Its totient is φ = 495000728984.

The previous prime is 990001457897. The next prime is 990001457999. The reversal of 990001457972 is 279754100099.

990001457972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 982743099556 + 7258358416 = 991334^2 + 85196^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123750182243 + ... + 123750182250.

It is an arithmetic number, because the mean of its divisors is an integer number (288750425243).

Almost surely, 2^990001457972 is an apocalyptic number.

It is an amenable number.

990001457972 is a deficient number, since it is larger than the sum of its proper divisors (742501093486).

990001457972 is a wasteful number, since it uses less digits than its factorization.

990001457972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247500364497 (or 247500364495 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 990001457972 in words is "nine hundred ninety billion, one million, four hundred fifty-seven thousand, nine hundred seventy-two".