19423640 has 32 divisors (see below), whose sum is σ = 44010000. Its totient is φ = 7714944.

The previous prime is 19423633. The next prime is 19423693. The reversal of 19423640 is 4632491.

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, 4331 + ... + 7589.

Almost surely, 2^19423640 is an apocalyptic number.

19423640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19423640 is an abundant number, since it is smaller than the sum of its proper divisors (24586360).

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

19423640 is a wasteful number, since it uses less digits than its factorization.

19423640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3419 (or 3415 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 19423640 is about 4407.2258848396. The cubic root of 19423640 is about 268.8088358655.

The spelling of 19423640 in words is "nineteen million, four hundred twenty-three thousand, six hundred forty".