1387139 has 4 divisors (see below), whose sum is σ = 1493856. Its totient is φ = 1280424.

The previous prime is 1387129. The next prime is 1387147. The reversal of 1387139 is 9317831.

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 1387139 - 2⁴ = 1387123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1387109) 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, 53339 + ... + 53364.

It is an arithmetic number, because the mean of its divisors is an integer number (373464).

2^1387139 is an apocalyptic number.

1387139 is a deficient number, since it is larger than the sum of its proper divisors (106717).

1387139 is a wasteful number, since it uses less digits than its factorization.

1387139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106716.

The product of its digits is 4536, while the sum is 32.

The square root of 1387139 is about 1177.7686530045. The cubic root of 1387139 is about 111.5252813232.

The spelling of 1387139 in words is "one million, three hundred eighty-seven thousand, one hundred thirty-nine".