19494431 has 12 divisors (see below), whose sum is σ = 21731136. Its totient is φ = 17471520.

The previous prime is 19494389. The next prime is 19494463. The reversal of 19494431 is 13449491.

It is a de Polignac number, because none of the positive numbers 2^k-19494431 is a prime.

It is a super-2 number, since 2×19494431² = 760065680027522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19494391 and 19494400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19494481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7730 + ... + 9936.

It is an arithmetic number, because the mean of its divisors is an integer number (1810928).

Almost surely, 2^19494431 is an apocalyptic number.

19494431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19494431 is a deficient number, since it is larger than the sum of its proper divisors (2236705).

19494431 is a wasteful number, since it uses less digits than its factorization.

19494431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302 (or 2291 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 19494431 is about 4415.2498230564. The cubic root of 19494431 is about 269.1350049929.

The spelling of 19494431 in words is "nineteen million, four hundred ninety-four thousand, four hundred thirty-one".