1157689 has 16 divisors (see below), whose sum is σ = 1355200. Its totient is φ = 979776.

The previous prime is 1157671. The next prime is 1157699. The reversal of 1157689 is 9867511.

It is a 4-Lehmer number, since φ(1157689) divides (1157689-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 1157689 - 2¹⁹ = 633401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1157609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10567 + ... + 10675.

It is an arithmetic number, because the mean of its divisors is an integer number (84700).

It is a Poulet number, since it divides 2^1157688-1.

2^1157689 is an apocalyptic number.

1157689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1157689 is a deficient number, since it is larger than the sum of its proper divisors (197511).

1157689 is a wasteful number, since it uses less digits than its factorization.

1157689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184.

The product of its digits is 15120, while the sum is 37.

The square root of 1157689 is about 1075.9595717312. The cubic root of 1157689 is about 105.0019349606.

The spelling of 1157689 in words is "one million, one hundred fifty-seven thousand, six hundred eighty-nine".