19449918 has 24 divisors (see below), whose sum is σ = 42225768. Its totient is φ = 6470352.

The previous prime is 19449893. The next prime is 19449943. The reversal of 19449918 is 81994491.

It is an interprime number because it is at equal distance from previous prime (19449893) and next prime (19449943).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13480 + ... + 14852.

It is an arithmetic number, because the mean of its divisors is an integer number (1759407).

Almost surely, 2^19449918 is an apocalyptic number.

19449918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19449918 is an abundant number, since it is smaller than the sum of its proper divisors (22775850).

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

19449918 is a wasteful number, since it uses less digits than its factorization.

19449918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168 (or 2165 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 19449918 is about 4410.2061176321. The cubic root of 19449918 is about 268.9300039454.

The spelling of 19449918 in words is "nineteen million, four hundred forty-nine thousand, nine hundred eighteen".