1125639 has 12 divisors (see below), whose sum is σ = 1637272. Its totient is φ = 745200.

The previous prime is 1125629. The next prime is 1125647. The reversal of 1125639 is 9365211.

1125639 is a `hidden beast` number, since 1 + 1 + 25 + 639 = 666.

It is not a de Polignac number, because 1125639 - 2⁹ = 1125127 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1284 + ... + 1974.

2^1125639 is an apocalyptic number.

1125639 is a deficient number, since it is larger than the sum of its proper divisors (511633).

1125639 is a wasteful number, since it uses less digits than its factorization.

1125639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 875 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 1125639 is about 1060.9613565064. The cubic root of 1125639 is about 104.0238788857.

It can be divided in two parts, 1125 and 639, that added together give a square (1764 = 42²).

The spelling of 1125639 in words is "one million, one hundred twenty-five thousand, six hundred thirty-nine".