18273340 has 24 divisors (see below), whose sum is σ = 39100320. Its totient is φ = 7171008.

The previous prime is 18273337. The next prime is 18273347. The reversal of 18273340 is 4337281.

It is a junction number, because it is equal to n+sod(n) for n = 18273299 and 18273308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18273347) 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, 7560 + ... + 9679.

It is an arithmetic number, because the mean of its divisors is an integer number (1629180).

Almost surely, 2^18273340 is an apocalyptic number.

18273340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18273340 is an abundant number, since it is smaller than the sum of its proper divisors (20826980).

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

18273340 is a wasteful number, since it uses less digits than its factorization.

18273340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17301 (or 17299 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 18273340 is about 4274.7327401839. The cubic root of 18273340 is about 263.3940610180.

The spelling of 18273340 in words is "eighteen million, two hundred seventy-three thousand, three hundred forty".