18240136 has 32 divisors (see below), whose sum is σ = 35280000. Its totient is φ = 8836416.

The previous prime is 18240119. The next prime is 18240137. The reversal of 18240136 is 63104281.

It is a super-2 number, since 2×18240136² = 665405122596992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18240136.

It is not an unprimeable number, because it can be changed into a prime (18240137) 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, 52090 + ... + 52438.

It is an arithmetic number, because the mean of its divisors is an integer number (1102500).

Almost surely, 2^18240136 is an apocalyptic number.

It is an amenable number.

18240136 is a deficient number, since it is larger than the sum of its proper divisors (17039864).

18240136 is a wasteful number, since it uses less digits than its factorization.

18240136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18240136 is about 4270.8472227416. The cubic root of 18240136 is about 263.2344288440.

The spelling of 18240136 in words is "eighteen million, two hundred forty thousand, one hundred thirty-six".