1661374 has 32 divisors (see below), whose sum is σ = 3026016. Its totient is φ = 673920.

The previous prime is 1661353. The next prime is 1661431. The reversal of 1661374 is 4731661.

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 15 ways as a sum of consecutive naturals, for example, 10504 + ... + 10660.

It is an arithmetic number, because the mean of its divisors is an integer number (94563).

2^1661374 is an apocalyptic number.

1661374 is a deficient number, since it is larger than the sum of its proper divisors (1364642).

1661374 is a wasteful number, since it uses less digits than its factorization.

1661374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220.

The product of its digits is 3024, while the sum is 28.

The square root of 1661374 is about 1288.9429777923. The cubic root of 1661374 is about 118.4374740615.

It can be divided in two parts, 166 and 1374, that added together give a triangular number (1540 = T₅₅).

The spelling of 1661374 in words is "one million, six hundred sixty-one thousand, three hundred seventy-four".