1821742 has 8 divisors (see below), whose sum is σ = 2942856. Its totient is φ = 840792.

The previous prime is 1821733. The next prime is 1821749. The reversal of 1821742 is 2471281.

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 (1821749) 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, 35008 + ... + 35059.

It is an arithmetic number, because the mean of its divisors is an integer number (367857).

2^1821742 is an apocalyptic number.

1821742 is a deficient number, since it is larger than the sum of its proper divisors (1121114).

1821742 is a wasteful number, since it uses less digits than its factorization.

1821742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70082.

The product of its digits is 896, while the sum is 25.

The square root of 1821742 is about 1349.7192300623. The cubic root of 1821742 is about 122.1318560071.

The spelling of 1821742 in words is "one million, eight hundred twenty-one thousand, seven hundred forty-two".