18405342 has 12 divisors (see below), whose sum is σ = 39878280. Its totient is φ = 6135108.

The previous prime is 18405329. The next prime is 18405349. The reversal of 18405342 is 24350481.

It is a super-2 number, since 2×18405342² = 677513228273928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18405349) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 511242 + ... + 511277.

It is an arithmetic number, because the mean of its divisors is an integer number (3323190).

Almost surely, 2^18405342 is an apocalyptic number.

18405342 is an abundant number, since it is smaller than the sum of its proper divisors (21472938).

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

18405342 is a wasteful number, since it uses less digits than its factorization.

18405342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022527 (or 1022524 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 18405342 is about 4290.1447528026. The cubic root of 18405342 is about 264.0267707012.

The spelling of 18405342 in words is "eighteen million, four hundred five thousand, three hundred forty-two".