1224139 has 4 divisors (see below), whose sum is σ = 1399024. Its totient is φ = 1049256.

The previous prime is 1224133. The next prime is 1224149. The reversal of 1224139 is 9314221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9314221 = 7 ⋅1330603.

It is a cyclic number.

It is not a de Polignac number, because 1224139 - 2³ = 1224131 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1224131) 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, 87432 + ... + 87445.

It is an arithmetic number, because the mean of its divisors is an integer number (349756).

2^1224139 is an apocalyptic number.

1224139 is a deficient number, since it is larger than the sum of its proper divisors (174885).

1224139 is an equidigital number, since it uses as much as digits as its factorization.

1224139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174884.

The product of its digits is 432, while the sum is 22.

The square root of 1224139 is about 1106.4081525368. The cubic root of 1224139 is about 106.9736739030.

The spelling of 1224139 in words is "one million, two hundred twenty-four thousand, one hundred thirty-nine".