18921342 has 16 divisors (see below), whose sum is σ = 41283072. Its totient is φ = 5733720.

The previous prime is 18921337. The next prime is 18921347. The reversal of 18921342 is 24312981.

It is an interprime number because it is at equal distance from previous prime (18921337) and next prime (18921347).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18921347) 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, 143278 + ... + 143409.

It is an arithmetic number, because the mean of its divisors is an integer number (2580192).

Almost surely, 2^18921342 is an apocalyptic number.

18921342 is an abundant number, since it is smaller than the sum of its proper divisors (22361730).

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

18921342 is a wasteful number, since it uses less digits than its factorization.

18921342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286703.

The product of its digits is 3456, while the sum is 30.

The square root of 18921342 is about 4349.8668945153. The cubic root of 18921342 is about 266.4714254910.

The spelling of 18921342 in words is "eighteen million, nine hundred twenty-one thousand, three hundred forty-two".