1408139 has 4 divisors (see below), whose sum is σ = 1429224. Its totient is φ = 1387056.

The previous prime is 1408123. The next prime is 1408151. The reversal of 1408139 is 9318041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1408139 - 2⁴ = 1408123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1408339) 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, 10442 + ... + 10575.

It is an arithmetic number, because the mean of its divisors is an integer number (357306).

2^1408139 is an apocalyptic number.

1408139 is a deficient number, since it is larger than the sum of its proper divisors (21085).

1408139 is an equidigital number, since it uses as much as digits as its factorization.

1408139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21084.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1408139 is about 1186.6503276029. The cubic root of 1408139 is about 112.0852613953.

The spelling of 1408139 in words is "one million, four hundred eight thousand, one hundred thirty-nine".