1989157 has 6 divisors (see below), whose sum is σ = 2045778. Its totient is φ = 1934064.

The previous prime is 1989151. The next prime is 1989161. The reversal of 1989157 is 7519891.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1674436 + 314721 = 1294^2 + 561^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1989157 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 (1989151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 643 + ... + 2095.

It is an arithmetic number, because the mean of its divisors is an integer number (340963).

2^1989157 is an apocalyptic number.

It is an amenable number.

1989157 is a deficient number, since it is larger than the sum of its proper divisors (56621).

1989157 is an equidigital number, since it uses as much as digits as its factorization.

1989157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527 (or 1490 counting only the distinct ones).

The product of its digits is 22680, while the sum is 40.

The square root of 1989157 is about 1410.3747728884. The cubic root of 1989157 is about 125.7640035418.

The spelling of 1989157 in words is "one million, nine hundred eighty-nine thousand, one hundred fifty-seven".