1977953408 has 24 divisors (see below), whose sum is σ = 3941456715. Its totient is φ = 988725120.

The previous prime is 1977953321. The next prime is 1977953477. The reversal of 1977953408 is 8043597791.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 988976704 + 988976704 = 31448^2 + 31448^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=31448.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1977953408.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 501203 + ... + 505133.

Almost surely, 2^1977953408 is an apocalyptic number.

It is an amenable number.

1977953408 is a deficient number, since it is larger than the sum of its proper divisors (1963503307).

1977953408 is an frugal number, since it uses more digits than its factorization.

1977953408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7876 (or 3933 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 1977953408 is about 44474.1881095091. The cubic root of 1977953408 is about 1255.2744399633.

The spelling of 1977953408 in words is "one billion, nine hundred seventy-seven million, nine hundred fifty-three thousand, four hundred eight".