1921158764 has 24 divisors (see below), whose sum is σ = 3843759360. Its totient is φ = 823044816.

The previous prime is 1921158751. The next prime is 1921158779. The reversal of 1921158764 is 4678511291.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

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, 73169 + ... + 95895.

It is an arithmetic number, because the mean of its divisors is an integer number (160156640).

Almost surely, 2^1921158764 is an apocalyptic number.

1921158764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1921158764 is an abundant number, since it is smaller than the sum of its proper divisors (1922600596).

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

1921158764 is a wasteful number, since it uses less digits than its factorization.

1921158764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25757 (or 25755 counting only the distinct ones).

The product of its digits is 120960, while the sum is 44.

The square root of 1921158764 is about 43831.0251306081. The cubic root of 1921158764 is about 1243.1429902338.

The spelling of 1921158764 in words is "one billion, nine hundred twenty-one million, one hundred fifty-eight thousand, seven hundred sixty-four".