1957661 has 8 divisors (see below), whose sum is σ = 2043360. Its totient is φ = 1873872.

The previous prime is 1957651. The next prime is 1957663. The reversal of 1957661 is 1667591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1957661 - 2¹⁰ = 1956637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1957663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1850 + ... + 2708.

It is an arithmetic number, because the mean of its divisors is an integer number (255420).

2^1957661 is an apocalyptic number.

It is an amenable number.

1957661 is a deficient number, since it is larger than the sum of its proper divisors (85699).

1957661 is an equidigital number, since it uses as much as digits as its factorization.

1957661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955.

The product of its digits is 11340, while the sum is 35.

The square root of 1957661 is about 1399.1643934863. The cubic root of 1957661 is about 125.0966931841.

The spelling of 1957661 in words is "one million, nine hundred fifty-seven thousand, six hundred sixty-one".