1977231948 has 48 divisors (see below), whose sum is σ = 4777500000. Its totient is φ = 635701248.

The previous prime is 1977231931. The next prime is 1977232003. The reversal of 1977231948 is 8491327791.

It is a self number, because there is not a number n which added to its sum of digits gives 1977231948.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432378 + ... + 436926.

It is an arithmetic number, because the mean of its divisors is an integer number (99531250).

Almost surely, 2^1977231948 is an apocalyptic number.

It is an amenable number.

1977231948 is an abundant number, since it is smaller than the sum of its proper divisors (2800268052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1977231948 is a wasteful number, since it uses less digits than its factorization.

1977231948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5834 (or 5832 counting only the distinct ones).

The product of its digits is 762048, while the sum is 51.

The square root of 1977231948 is about 44466.0763728935. The cubic root of 1977231948 is about 1255.1218006366.

The spelling of 1977231948 in words is "one billion, nine hundred seventy-seven million, two hundred thirty-one thousand, nine hundred forty-eight".