1387905 has 16 divisors (see below), whose sum is σ = 2255424. Its totient is φ = 728640.

The previous prime is 1387879. The next prime is 1387913. The reversal of 1387905 is 5097831.

It is not a de Polignac number, because 1387905 - 2⁸ = 1387649 is a prime.

It is a d-powerful number, because it can be written as 1 + 3³ + 8⁵ + 7⁷ + 9⁶ + 0 + 5³ .

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, 315 + ... + 1695.

It is an arithmetic number, because the mean of its divisors is an integer number (140964).

2^1387905 is an apocalyptic number.

1387905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1387905 is a deficient number, since it is larger than the sum of its proper divisors (867519).

1387905 is a wasteful number, since it uses less digits than its factorization.

1387905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 1387905 is about 1178.0937993216. The cubic root of 1387905 is about 111.5458062178.

The spelling of 1387905 in words is "one million, three hundred eighty-seven thousand, nine hundred five".