19425840 has 160 divisors (see below), whose sum is σ = 71233536. Its totient is φ = 4285440.

The previous prime is 19425839. The next prime is 19425893. The reversal of 19425840 is 4852491.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51894 + ... + 52266.

Almost surely, 2^19425840 is an apocalyptic number.

19425840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19425840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35616768).

19425840 is an abundant number, since it is smaller than the sum of its proper divisors (51807696).

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

19425840 is a wasteful number, since it uses less digits than its factorization.

19425840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 19425840 is about 4407.4754678841. The cubic root of 19425840 is about 268.8189842743.

The spelling of 19425840 in words is "nineteen million, four hundred twenty-five thousand, eight hundred forty".