1922157540 has 60 divisors (see below), whose sum is σ = 6029884476. Its totient is φ = 512574912.

The previous prime is 1922157533. The next prime is 1922157551. The reversal of 1922157540 is 457512291.

1922157540 is a `hidden beast` number, since 1 + 92 + 21 + 5 + 7 + 540 = 666.

1922157540 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1332542016 + 589615524 = 36504^2 + 24282^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1922157495 and 1922157504.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 591639 + ... + 594878.

Almost surely, 2^1922157540 is an apocalyptic number.

1922157540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1922157540 is an abundant number, since it is smaller than the sum of its proper divisors (4107726936).

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

1922157540 is a wasteful number, since it uses less digits than its factorization.

1922157540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186538 (or 1186527 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 1922157540 is about 43842.4171322704. The cubic root of 1922157540 is about 1243.3583821634.

The spelling of 1922157540 in words is "one billion, nine hundred twenty-two million, one hundred fifty-seven thousand, five hundred forty".