1387138 has 4 divisors (see below), whose sum is σ = 2080710. Its totient is φ = 693568.

The previous prime is 1387129. The next prime is 1387147. The reversal of 1387138 is 8317831.

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

It is an interprime number because it is at equal distance from previous prime (1387129) and next prime (1387147).

It can be written as a sum of positive squares in only one way, i.e., 994009 + 393129 = 997^2 + 627^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346783 + ... + 346786.

2^1387138 is an apocalyptic number.

1387138 is a deficient number, since it is larger than the sum of its proper divisors (693572).

1387138 is an equidigital number, since it uses as much as digits as its factorization.

1387138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693571.

The product of its digits is 4032, while the sum is 31.

The square root of 1387138 is about 1177.7682284728. The cubic root of 1387138 is about 111.5252545233.

The spelling of 1387138 in words is "one million, three hundred eighty-seven thousand, one hundred thirty-eight".