1387855 has 16 divisors (see below), whose sum is σ = 2004480. Its totient is φ = 901152.

The previous prime is 1387849. The next prime is 1387871. The reversal of 1387855 is 5587831.

It is not a de Polignac number, because 1387855 - 2³ = 1387847 is a prime.

It is a super-2 number, since 2×1387855² = 3852283002050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379 + ... + 1708.

It is an arithmetic number, because the mean of its divisors is an integer number (125280).

2^1387855 is an apocalyptic number.

1387855 is a deficient number, since it is larger than the sum of its proper divisors (616625).

1387855 is a wasteful number, since it uses less digits than its factorization.

1387855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118.

The product of its digits is 33600, while the sum is 37.

The square root of 1387855 is about 1178.0725784093. The cubic root of 1387855 is about 111.5444667031.

The spelling of 1387855 in words is "one million, three hundred eighty-seven thousand, eight hundred fifty-five".