1809142 has 8 divisors (see below), whose sum is σ = 2856600. Its totient is φ = 856944.

The previous prime is 1809133. The next prime is 1809149. The reversal of 1809142 is 2419081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23767 + ... + 23842.

It is an arithmetic number, because the mean of its divisors is an integer number (357075).

2^1809142 is an apocalyptic number.

1809142 is a deficient number, since it is larger than the sum of its proper divisors (1047458).

1809142 is a wasteful number, since it uses less digits than its factorization.

1809142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47630.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1809142 is about 1345.0434937206. The cubic root of 1809142 is about 121.8496310993.

The spelling of 1809142 in words is "one million, eight hundred nine thousand, one hundred forty-two".