19304140 has 48 divisors (see below), whose sum is σ = 42547680. Its totient is φ = 7347200.

The previous prime is 19304123. The next prime is 19304141. The reversal of 19304140 is 4140391.

19304140 = T₇₃ + T₇₄ + ... + T₄₈₇.

It is a super-2 number, since 2×19304140² = 745299642279200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19304141) 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, 47940 + ... + 48340.

It is an arithmetic number, because the mean of its divisors is an integer number (886410).

Almost surely, 2^19304140 is an apocalyptic number.

19304140 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 19304140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21273840).

19304140 is an abundant number, since it is smaller than the sum of its proper divisors (23243540).

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

19304140 is a wasteful number, since it uses less digits than its factorization.

19304140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 19304140 is about 4393.6476872867. The cubic root of 19304140 is about 268.2564375507.

The spelling of 19304140 in words is "nineteen million, three hundred four thousand, one hundred forty".