1921872624 has 40 divisors (see below), whose sum is σ = 5674101120. Its totient is φ = 549106368.

The previous prime is 1921872607. The next prime is 1921872637. The reversal of 1921872624 is 4262781291.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 2859594 + ... + 2860265.

It is an arithmetic number, because the mean of its divisors is an integer number (141852528).

Almost surely, 2^1921872624 is an apocalyptic number.

1921872624 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1921872624 is an abundant number, since it is smaller than the sum of its proper divisors (3752228496).

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

1921872624 is a wasteful number, since it uses less digits than its factorization.

1921872624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5719877 (or 5719871 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 1921872624 is about 43839.1676928292. The cubic root of 1921872624 is about 1243.2969459571.

The spelling of 1921872624 in words is "one billion, nine hundred twenty-one million, eight hundred seventy-two thousand, six hundred twenty-four".