1387131 has 4 divisors (see below), whose sum is σ = 1849512. Its totient is φ = 924752.

The previous prime is 1387129. The next prime is 1387147. The reversal of 1387131 is 1317831.

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 1387131 - 2¹ = 1387129 is a prime.

It is a super-2 number, since 2×1387131² = 3848264822322, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1387121) 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, 231186 + ... + 231191.

It is an arithmetic number, because the mean of its divisors is an integer number (462378).

2^1387131 is an apocalyptic number.

1387131 is a deficient number, since it is larger than the sum of its proper divisors (462381).

1387131 is an equidigital number, since it uses as much as digits as its factorization.

1387131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462380.

The product of its digits is 504, while the sum is 24.

The square root of 1387131 is about 1177.7652567469. The cubic root of 1387131 is about 111.5250669241.

The spelling of 1387131 in words is "one million, three hundred eighty-seven thousand, one hundred thirty-one".