1982157 has 4 divisors (see below), whose sum is σ = 2642880. Its totient is φ = 1321436.

The previous prime is 1982153. The next prime is 1982159. The reversal of 1982157 is 7512891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7512891 = 3 ⋅2504297.

It is a cyclic number.

It is not a de Polignac number, because 1982157 - 2² = 1982153 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982153) 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, 330357 + ... + 330362.

It is an arithmetic number, because the mean of its divisors is an integer number (660720).

2^1982157 is an apocalyptic number.

It is an amenable number.

1982157 is a deficient number, since it is larger than the sum of its proper divisors (660723).

1982157 is an equidigital number, since it uses as much as digits as its factorization.

1982157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660722.

The product of its digits is 5040, while the sum is 33.

The square root of 1982157 is about 1407.8909758927. The cubic root of 1982157 is about 125.6163056778.

The spelling of 1982157 in words is "one million, nine hundred eighty-two thousand, one hundred fifty-seven".