1661364 has 24 divisors (see below), whose sum is σ = 4307520. Its totient is φ = 553752.

The previous prime is 1661353. The next prime is 1661431. The reversal of 1661364 is 4631661.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7584 + ... + 7799.

It is an arithmetic number, because the mean of its divisors is an integer number (179480).

2^1661364 is an apocalyptic number.

It is an amenable number.

1661364 is an abundant number, since it is smaller than the sum of its proper divisors (2646156).

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

1661364 is a wasteful number, since it uses less digits than its factorization.

1661364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15396 (or 15388 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1661364 is about 1288.9390986389. The cubic root of 1661364 is about 118.4372364314.

It can be divided in two parts, 1661 and 364, that added together give a square (2025 = 45²).

The spelling of 1661364 in words is "one million, six hundred sixty-one thousand, three hundred sixty-four".