1977730942 has 8 divisors (see below), whose sum is σ = 3236287032. Its totient is φ = 898968600.

The previous prime is 1977730939. The next prime is 1977730961. The reversal of 1977730942 is 2490377791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1977730942² = 7822839357888414728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44948409 + ... + 44948452.

It is an arithmetic number, because the mean of its divisors is an integer number (404535879).

Almost surely, 2^1977730942 is an apocalyptic number.

1977730942 is a deficient number, since it is larger than the sum of its proper divisors (1258556090).

1977730942 is a wasteful number, since it uses less digits than its factorization.

1977730942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89896874.

The product of its (nonzero) digits is 666792, while the sum is 49.

The square root of 1977730942 is about 44471.6869704759. The cubic root of 1977730942 is about 1255.2273767796.

The spelling of 1977730942 in words is "one billion, nine hundred seventy-seven million, seven hundred thirty thousand, nine hundred forty-two".