1977018444 has 36 divisors (see below), whose sum is σ = 5000520616. Its totient is φ = 658603008.

The previous prime is 1977018437. The next prime is 1977018487. The reversal of 1977018444 is 4448107791.

It is a happy number.

1977018444 is a `hidden beast` number, since 197 + 7 + 0 + 18 + 444 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1977018444² = 7817203855832362272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1977018444.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46092 + ... + 77964.

Almost surely, 2^1977018444 is an apocalyptic number.

It is an amenable number.

1977018444 is an abundant number, since it is smaller than the sum of its proper divisors (3023502172).

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

1977018444 is a wasteful number, since it uses less digits than its factorization.

1977018444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33606 (or 33601 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 1977018444 is about 44463.6755565709. The cubic root of 1977018444 is about 1255.0766224653.

The spelling of 1977018444 in words is "one billion, nine hundred seventy-seven million, eighteen thousand, four hundred forty-four".