1977940156 has 6 divisors (see below), whose sum is σ = 3461395280. Its totient is φ = 988970076.

The previous prime is 1977940141. The next prime is 1977940171. The reversal of 1977940156 is 6510497791.

It is an interprime number because it is at equal distance from previous prime (1977940141) and next prime (1977940171).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247242516 + ... + 247242523.

Almost surely, 2^1977940156 is an apocalyptic number.

It is an amenable number.

1977940156 is a deficient number, since it is larger than the sum of its proper divisors (1483455124).

1977940156 is a wasteful number, since it uses less digits than its factorization.

1977940156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494485043 (or 494485041 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 49.

The square root of 1977940156 is about 44474.0391239653. The cubic root of 1977940156 is about 1255.2716365717.

The spelling of 1977940156 in words is "one billion, nine hundred seventy-seven million, nine hundred forty thousand, one hundred fifty-six".