919811972 has 24 divisors (see below), whose sum is σ = 1643703096. Its totient is φ = 450275328.

The previous prime is 919811969. The next prime is 919811993. The reversal of 919811972 is 279118919.

It can be written as a sum of positive squares in 4 ways, for example, as 331458436 + 588353536 = 18206^2 + 24256^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28508 + ... + 51500.

It is an arithmetic number, because the mean of its divisors is an integer number (68487629).

Almost surely, 2^919811972 is an apocalyptic number.

It is an amenable number.

919811972 is a deficient number, since it is larger than the sum of its proper divisors (723891124).

919811972 is a wasteful number, since it uses less digits than its factorization.

919811972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23207 (or 23205 counting only the distinct ones).

The product of its digits is 81648, while the sum is 47.

The square root of 919811972 is about 30328.4020680286. The cubic root of 919811972 is about 972.5225630335.

The spelling of 919811972 in words is "nine hundred nineteen million, eight hundred eleven thousand, nine hundred seventy-two".