1661874 has 16 divisors (see below), whose sum is σ = 3438720. Its totient is φ = 534800.

The previous prime is 1661861. The next prime is 1661887. The reversal of 1661874 is 4781661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1661861) and next prime (1661887).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4602 + ... + 4949.

It is an arithmetic number, because the mean of its divisors is an integer number (214920).

2^1661874 is an apocalyptic number.

1661874 is an abundant number, since it is smaller than the sum of its proper divisors (1776846).

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

1661874 is a wasteful number, since it uses less digits than its factorization.

1661874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9585.

The product of its digits is 8064, while the sum is 33.

The square root of 1661874 is about 1289.1369205790. The cubic root of 1661874 is about 118.4493543480.

The spelling of 1661874 in words is "one million, six hundred sixty-one thousand, eight hundred seventy-four".