1661774 has 4 divisors (see below), whose sum is σ = 2492664. Its totient is φ = 830886.

The previous prime is 1661741. The next prime is 1661789. The reversal of 1661774 is 4771661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4771661 = 281 ⋅16981.

It is a super-2 number, since 2×1661774² = 5522985654152, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661774.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415442 + ... + 415445.

It is an arithmetic number, because the mean of its divisors is an integer number (623166).

2^1661774 is an apocalyptic number.

1661774 is a deficient number, since it is larger than the sum of its proper divisors (830890).

1661774 is an equidigital number, since it uses as much as digits as its factorization.

1661774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830889.

The product of its digits is 7056, while the sum is 32.

The square root of 1661774 is about 1289.0981343560. The cubic root of 1661774 is about 118.4469784813.

The spelling of 1661774 in words is "one million, six hundred sixty-one thousand, seven hundred seventy-four".