19434840 has 32 divisors (see below), whose sum is σ = 58304880. Its totient is φ = 5182592.

The previous prime is 19434827. The next prime is 19434851. The reversal of 19434840 is 4843491.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80859 + ... + 81098.

Almost surely, 2^19434840 is an apocalyptic number.

19434840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19434840 is an abundant number, since it is smaller than the sum of its proper divisors (38870040).

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

19434840 is a wasteful number, since it uses less digits than its factorization.

19434840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161971 (or 161967 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 19434840 is about 4408.4963422918. The cubic root of 19434840 is about 268.8604925149.

The spelling of 19434840 in words is "nineteen million, four hundred thirty-four thousand, eight hundred forty".