18419636 has 24 divisors (see below), whose sum is σ = 35057736. Its totient is φ = 8432640.

The previous prime is 18419633. The next prime is 18419641. The reversal of 18419636 is 63691481.

It can be written as a sum of positive squares in 4 ways, for example, as 2579236 + 15840400 = 1606^2 + 3980^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18419636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18419633) 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, 1145 + ... + 6176.

It is an arithmetic number, because the mean of its divisors is an integer number (1460739).

Almost surely, 2^18419636 is an apocalyptic number.

It is an amenable number.

18419636 is a deficient number, since it is larger than the sum of its proper divisors (16638100).

18419636 is a wasteful number, since it uses less digits than its factorization.

18419636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7379 (or 7377 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 18419636 is about 4291.8103406372. The cubic root of 18419636 is about 264.0951027121.

The spelling of 18419636 in words is "eighteen million, four hundred nineteen thousand, six hundred thirty-six".