19874240 has 56 divisors (see below), whose sum is σ = 47731680. Its totient is φ = 7881728.

The previous prime is 19874237. The next prime is 19874243. The reversal of 19874240 is 4247891.

It is an interprime number because it is at equal distance from previous prime (19874237) and next prime (19874243).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 19874240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19874243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55181 + ... + 55539.

Almost surely, 2^19874240 is an apocalyptic number.

19874240 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 19874240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23865840).

19874240 is an abundant number, since it is smaller than the sum of its proper divisors (27857440).

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

19874240 is a wasteful number, since it uses less digits than its factorization.

19874240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 19874240 is about 4458.0533868495. The cubic root of 19874240 is about 270.8716230414.

The spelling of 19874240 in words is "nineteen million, eight hundred seventy-four thousand, two hundred forty".