19649894 has 16 divisors (see below), whose sum is σ = 32636736. Its totient is φ = 8797800.

The previous prime is 19649893. The next prime is 19649897. The reversal of 19649894 is 49894691.

It is a happy number.

It is a super-2 number, since 2×19649894² = 772236668422472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19649893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5192 + ... + 8139.

It is an arithmetic number, because the mean of its divisors is an integer number (2039796).

Almost surely, 2^19649894 is an apocalyptic number.

19649894 is a deficient number, since it is larger than the sum of its proper divisors (12986842).

19649894 is a wasteful number, since it uses less digits than its factorization.

19649894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13411.

The product of its digits is 559872, while the sum is 50.

The square root of 19649894 is about 4432.8200956051. The cubic root of 19649894 is about 269.8485387364.

The spelling of 19649894 in words is "nineteen million, six hundred forty-nine thousand, eight hundred ninety-four".