1966157 has 4 divisors (see below), whose sum is σ = 1973436. Its totient is φ = 1958880.

The previous prime is 1966127. The next prime is 1966163. The reversal of 1966157 is 7516691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 978121 + 988036 = 989^2 + 994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966157 - 2¹⁰ = 1965133 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 (1966127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3218 + ... + 3779.

It is an arithmetic number, because the mean of its divisors is an integer number (493359).

2^1966157 is an apocalyptic number.

It is an amenable number.

1966157 is a deficient number, since it is larger than the sum of its proper divisors (7279).

1966157 is an equidigital number, since it uses as much as digits as its factorization.

1966157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278.

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

The square root of 1966157 is about 1402.1972043903. The cubic root of 1966157 is about 125.2773999388.

The spelling of 1966157 in words is "one million, nine hundred sixty-six thousand, one hundred fifty-seven".