1870661 has 6 divisors (see below), whose sum is σ = 2025810. Its totient is φ = 1726608.

The previous prime is 1870651. The next prime is 1870667. The reversal of 1870661 is 1660781.

It can be written as a sum of positive squares in 3 ways, for example, as 101761 + 1768900 = 319^2 + 1330^2 .

It is not a de Polignac number, because 1870661 - 2⁶ = 1870597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1870667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5366 + ... + 5703.

It is an arithmetic number, because the mean of its divisors is an integer number (337635).

2^1870661 is an apocalyptic number.

It is an amenable number.

1870661 is a deficient number, since it is larger than the sum of its proper divisors (155149).

1870661 is a wasteful number, since it uses less digits than its factorization.

1870661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11095 (or 11082 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1870661 is about 1367.7210973002. The cubic root of 1870661 is about 123.2154111898.

The spelling of 1870661 in words is "one million, eight hundred seventy thousand, six hundred sixty-one".