1137989 has 4 divisors (see below), whose sum is σ = 1177260. Its totient is φ = 1098720.

The previous prime is 1137977. The next prime is 1137991. The reversal of 1137989 is 9897311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9897311 = 61 ⋅162251.

It can be written as a sum of positive squares in 2 ways, for example, as 429025 + 708964 = 655^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 1137989 - 2⁴ = 1137973 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 (1137919) 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, 19592 + ... + 19649.

It is an arithmetic number, because the mean of its divisors is an integer number (294315).

2^1137989 is an apocalyptic number.

It is an amenable number.

1137989 is a deficient number, since it is larger than the sum of its proper divisors (39271).

1137989 is an equidigital number, since it uses as much as digits as its factorization.

1137989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39270.

The product of its digits is 13608, while the sum is 38.

The square root of 1137989 is about 1066.7656724886. The cubic root of 1137989 is about 104.4029302427.

The spelling of 1137989 in words is "one million, one hundred thirty-seven thousand, nine hundred eighty-nine".