19242440 has 64 divisors (see below), whose sum is σ = 52099200. Its totient is φ = 6248448.

The previous prime is 19242439. The next prime is 19242449. The reversal of 19242440 is 4424291.

It is not an unprimeable number, because it can be changed into a prime (19242449) 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, 3512 + ... + 7128.

It is an arithmetic number, because the mean of its divisors is an integer number (814050).

Almost surely, 2^19242440 is an apocalyptic number.

19242440 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 19242440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26049600).

19242440 is an abundant number, since it is smaller than the sum of its proper divisors (32856760).

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

19242440 is a wasteful number, since it uses less digits than its factorization.

19242440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654 (or 3650 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 19242440 is about 4386.6205671337. The cubic root of 19242440 is about 267.9703316084.

The spelling of 19242440 in words is "nineteen million, two hundred forty-two thousand, four hundred forty".