1809742 has 8 divisors (see below), whose sum is σ = 2961432. Its totient is φ = 822600.

The previous prime is 1809683. The next prime is 1809751. The reversal of 1809742 is 2479081.

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

It is a super-2 number, since 2×1809742² = 6550332213128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41109 + ... + 41152.

It is an arithmetic number, because the mean of its divisors is an integer number (370179).

2^1809742 is an apocalyptic number.

1809742 is a deficient number, since it is larger than the sum of its proper divisors (1151690).

1809742 is a wasteful number, since it uses less digits than its factorization.

1809742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82274.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1809742 is about 1345.2665163454. The cubic root of 1809742 is about 121.8631000435.

The spelling of 1809742 in words is "one million, eight hundred nine thousand, seven hundred forty-two".