19494866 has 12 divisors (see below), whose sum is σ = 29637258. Its totient is φ = 9616512.

The previous prime is 19494863. The next prime is 19494899. The reversal of 19494866 is 66849491.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6325225 + 13169641 = 2515^2 + 3629^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19494866.

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 polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61340 + ... + 61656.

Almost surely, 2^19494866 is an apocalyptic number.

19494866 is a deficient number, since it is larger than the sum of its proper divisors (10142392).

19494866 is an frugal number, since it uses more digits than its factorization.

19494866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733 (or 416 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 19494866 is about 4415.2990838674. The cubic root of 19494866 is about 269.1370068100.

The spelling of 19494866 in words is "nineteen million, four hundred ninety-four thousand, eight hundred sixty-six".