1977820372 has 12 divisors (see below), whose sum is σ = 3775838976. Its totient is φ = 899009240.

The previous prime is 1977820337. The next prime is 1977820381. The reversal of 1977820372 is 2730287791.

It is a happy number.

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, 22475188 + ... + 22475275.

It is an arithmetic number, because the mean of its divisors is an integer number (314653248).

Almost surely, 2^1977820372 is an apocalyptic number.

It is an amenable number.

1977820372 is a deficient number, since it is larger than the sum of its proper divisors (1798018604).

1977820372 is a wasteful number, since it uses less digits than its factorization.

1977820372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44950478 (or 44950476 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 1977820372 is about 44472.6924302993. The cubic root of 1977820372 is about 1255.2462963219.

The spelling of 1977820372 in words is "one billion, nine hundred seventy-seven million, eight hundred twenty thousand, three hundred seventy-two".