1661370 has 32 divisors (see below), whose sum is σ = 4043520. Its totient is φ = 436800.

The previous prime is 1661353. The next prime is 1661431. The reversal of 1661370 is 731661.

It is a self number, because there is not a number n which added to its sum of digits gives 1661370.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2020 + ... + 2720.

It is an arithmetic number, because the mean of its divisors is an integer number (126360).

2^1661370 is an apocalyptic number.

1661370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661370 is an abundant number, since it is smaller than the sum of its proper divisors (2382150).

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

1661370 is a wasteful number, since it uses less digits than its factorization.

1661370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1661370 is about 1288.9414261323. The cubic root of 1661370 is about 118.4373790096.

The spelling of 1661370 in words is "one million, six hundred sixty-one thousand, three hundred seventy".