1387939 has 4 divisors (see below), whose sum is σ = 1586224. Its totient is φ = 1189656.

The previous prime is 1387927. The next prime is 1387943. The reversal of 1387939 is 9397831.

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 1387939 - 2⁹ = 1387427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99132 + ... + 99145.

It is an arithmetic number, because the mean of its divisors is an integer number (396556).

2^1387939 is an apocalyptic number.

1387939 is a deficient number, since it is larger than the sum of its proper divisors (198285).

1387939 is an equidigital number, since it uses as much as digits as its factorization.

1387939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198284.

The product of its digits is 40824, while the sum is 40.

The square root of 1387939 is about 1178.1082293236. The cubic root of 1387939 is about 111.5467170694.

The spelling of 1387939 in words is "one million, three hundred eighty-seven thousand, nine hundred thirty-nine".