1977928118 has 8 divisors (see below), whose sum is σ = 2967236712. Its totient is φ = 988849216.

The previous prime is 1977928103. The next prime is 1977928201. The reversal of 1977928118 is 8118297791.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1977928118.

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, 33980 + ... + 71487.

It is an arithmetic number, because the mean of its divisors is an integer number (370904589).

Almost surely, 2^1977928118 is an apocalyptic number.

1977928118 is a deficient number, since it is larger than the sum of its proper divisors (989308594).

1977928118 is a wasteful number, since it uses less digits than its factorization.

1977928118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114846.

The product of its digits is 508032, while the sum is 53.

The square root of 1977928118 is about 44473.9037863779. The cubic root of 1977928118 is about 1255.2690899846.

The spelling of 1977928118 in words is "one billion, nine hundred seventy-seven million, nine hundred twenty-eight thousand, one hundred eighteen".