19494864 has 40 divisors (see below), whose sum is σ = 55958720. Its totient is φ = 6498144.

The previous prime is 19494863. The next prime is 19494899. The reversal of 19494864 is 46849491.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19494863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22132 + ... + 22995.

It is an arithmetic number, because the mean of its divisors is an integer number (1398968).

Almost surely, 2^19494864 is an apocalyptic number.

It is an amenable number.

19494864 is an abundant number, since it is smaller than the sum of its proper divisors (36463856).

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

19494864 is a wasteful number, since it uses less digits than its factorization.

19494864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45144 (or 45132 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 19494864 is about 4415.2988573821. The cubic root of 19494864 is about 269.1369976063.

It can be divided in two parts, 19494 and 864, that multiplied together give a square (16842816 = 4104²).

The spelling of 19494864 in words is "nineteen million, four hundred ninety-four thousand, eight hundred sixty-four".