1812342 has 16 divisors (see below), whose sum is σ = 4142592. Its totient is φ = 517800.

The previous prime is 1812341. The next prime is 1812347. The reversal of 1812342 is 2432181.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812341) 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, 21534 + ... + 21617.

It is an arithmetic number, because the mean of its divisors is an integer number (258912).

2^1812342 is an apocalyptic number.

1812342 is an abundant number, since it is smaller than the sum of its proper divisors (2330250).

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

1812342 is a wasteful number, since it uses less digits than its factorization.

1812342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43163.

The product of its digits is 384, while the sum is 21.

The square root of 1812342 is about 1346.2325207779. The cubic root of 1812342 is about 121.9214310925.

The spelling of 1812342 in words is "one million, eight hundred twelve thousand, three hundred forty-two".