3977556442 has 4 divisors (see below), whose sum is σ = 5966334666. Its totient is φ = 1988778220.

The previous prime is 3977556421. The next prime is 3977556469. The reversal of 3977556442 is 2446557793.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2419754481 + 1557801961 = 49191^2 + 39469^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3977556442.

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 as a sum of consecutive naturals, namely, 994389109 + ... + 994389112.

Almost surely, 2^3977556442 is an apocalyptic number.

3977556442 is a deficient number, since it is larger than the sum of its proper divisors (1988778224).

3977556442 is a wasteful number, since it uses less digits than its factorization.

3977556442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988778223.

The product of its digits is 6350400, while the sum is 52.

The square root of 3977556442 is about 63067.8717097699. The cubic root of 3977556442 is about 1584.4265712196.

The spelling of 3977556442 in words is "three billion, nine hundred seventy-seven million, five hundred fifty-six thousand, four hundred forty-two".