1979157 has 16 divisors (see below), whose sum is σ = 2823552. Its totient is φ = 1228800.

The previous prime is 1979149. The next prime is 1979171. The reversal of 1979157 is 7519791.

It is not a de Polignac number, because 1979157 - 2³ = 1979149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979147) 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 15 ways as a sum of consecutive naturals, for example, 7573 + ... + 7829.

It is an arithmetic number, because the mean of its divisors is an integer number (176472).

2^1979157 is an apocalyptic number.

1979157 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1979157 is a deficient number, since it is larger than the sum of its proper divisors (844395).

1979157 is a wasteful number, since it uses less digits than its factorization.

1979157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428.

The product of its digits is 19845, while the sum is 39.

The square root of 1979157 is about 1406.8251490502. The cubic root of 1979157 is about 125.5529001390.

The spelling of 1979157 in words is "one million, nine hundred seventy-nine thousand, one hundred fifty-seven".