1217139 has 24 divisors (see below), whose sum is σ = 2042880. Its totient is φ = 630960.

The previous prime is 1217131. The next prime is 1217141. The reversal of 1217139 is 9317121.

It is not a de Polignac number, because 1217139 - 2³ = 1217131 is a prime.

1217139 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2302 + ... + 2780.

It is an arithmetic number, because the mean of its divisors is an integer number (85120).

2^1217139 is an apocalyptic number.

1217139 is a deficient number, since it is larger than the sum of its proper divisors (825741).

1217139 is a wasteful number, since it uses less digits than its factorization.

1217139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 500 counting only the distinct ones).

The product of its digits is 378, while the sum is 24.

The square root of 1217139 is about 1103.2402276930. The cubic root of 1217139 is about 106.7693813109.

It can be divided in two parts, 121 and 7139, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 1217139 in words is "one million, two hundred seventeen thousand, one hundred thirty-nine".