19791240 has 64 divisors (see below), whose sum is σ = 67858560. Its totient is φ = 4523520.

The previous prime is 19791203. The next prime is 19791241. The reversal of 19791240 is 4219791.

It is not an unprimeable number, because it can be changed into a prime (19791241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10941 + ... + 12620.

It is an arithmetic number, because the mean of its divisors is an integer number (1060290).

Almost surely, 2^19791240 is an apocalyptic number.

19791240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19791240 is an abundant number, since it is smaller than the sum of its proper divisors (48067320).

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

19791240 is a wasteful number, since it uses less digits than its factorization.

19791240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23582 (or 23578 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 19791240 is about 4448.7346515610. The cubic root of 19791240 is about 270.4940200923.

The spelling of 19791240 in words is "nineteen million, seven hundred ninety-one thousand, two hundred forty".