19190840 has 16 divisors (see below), whose sum is σ = 43179480. Its totient is φ = 7676320.

The previous prime is 19190839. The next prime is 19190849. The reversal of 19190840 is 4809191.

It is a junction number, because it is equal to n+sod(n) for n = 19190797 and 19190806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19190849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239846 + ... + 239925.

Almost surely, 2^19190840 is an apocalyptic number.

19190840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19190840 is an abundant number, since it is smaller than the sum of its proper divisors (23988640).

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

19190840 is a wasteful number, since it uses less digits than its factorization.

19190840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479782 (or 479778 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 19190840 is about 4380.7350981314. The cubic root of 19190840 is about 267.7305898854.

The spelling of 19190840 in words is "nineteen million, one hundred ninety thousand, eight hundred forty".