18194840 has 32 divisors (see below), whose sum is σ = 42720480. Its totient is φ = 6961152.

The previous prime is 18194821. The next prime is 18194843. The reversal of 18194840 is 4849181.

It is a self number, because there is not a number n which added to its sum of digits gives 18194840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18194843) 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, 8969 + ... + 10808.

It is an arithmetic number, because the mean of its divisors is an integer number (1335015).

Almost surely, 2^18194840 is an apocalyptic number.

18194840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18194840 is an abundant number, since it is smaller than the sum of its proper divisors (24525640).

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

18194840 is a wasteful number, since it uses less digits than its factorization.

18194840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19811 (or 19807 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18194840 is about 4265.5409973414. The cubic root of 18194840 is about 263.0163502391.

The spelling of 18194840 in words is "eighteen million, one hundred ninety-four thousand, eight hundred forty".