1922640 has 40 divisors (see below), whose sum is σ = 5960928. Its totient is φ = 512640.

The previous prime is 1922621. The next prime is 1922663. The reversal of 1922640 is 462291.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1922640.

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, 3766 + ... + 4245.

2^1922640 is an apocalyptic number.

1922640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1922640 is an abundant number, since it is smaller than the sum of its proper divisors (4038288).

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

1922640 is a wasteful number, since it uses less digits than its factorization.

1922640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8027 (or 8021 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1922640 is about 1386.5929467583. The cubic root of 1922640 is about 124.3462400780.

The spelling of 1922640 in words is "one million, nine hundred twenty-two thousand, six hundred forty".