19243240 has 64 divisors (see below), whose sum is σ = 45781200. Its totient is φ = 7268352.

The previous prime is 19243207. The next prime is 19243241. The reversal of 19243240 is 4234291.

It can be written as a sum of positive squares in 8 ways, for example, as 4235364 + 15007876 = 2058^2 + 3874^2 .

It is not an unprimeable number, because it can be changed into a prime (19243241) 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, 61324 + ... + 61636.

Almost surely, 2^19243240 is an apocalyptic number.

19243240 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 19243240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22890600).

19243240 is an abundant number, since it is smaller than the sum of its proper divisors (26537960).

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

19243240 is a wasteful number, since it uses less digits than its factorization.

19243240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 19243240 is about 4386.7117525545. The cubic root of 19243240 is about 267.9740451585.

The spelling of 19243240 in words is "nineteen million, two hundred forty-three thousand, two hundred forty".