1979400499544 has 16 divisors (see below), whose sum is σ = 3996866393520. Its totient is φ = 913569461280.

The previous prime is 1979400499543. The next prime is 1979400499547. The reversal of 1979400499544 is 4459940049791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979400499541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9516348452 + ... + 9516348659.

It is an arithmetic number, because the mean of its divisors is an integer number (249804149595).

Almost surely, 2^{1979400499544} is an apocalyptic number.

It is an amenable number.

1979400499544 is an abundant number, since it is smaller than the sum of its proper divisors (2017465893976).

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

1979400499544 is a wasteful number, since it uses less digits than its factorization.

1979400499544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19032697130 (or 19032697126 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 65.

The spelling of 1979400499544 in words is "one trillion, nine hundred seventy-nine billion, four hundred million, four hundred ninety-nine thousand, five hundred forty-four".