1387890 has 48 divisors (see below), whose sum is σ = 4125888. Its totient is φ = 317088.

The previous prime is 1387879. The next prime is 1387913. The reversal of 1387890 is 987831.

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 472 + ... + 1731.

It is an arithmetic number, because the mean of its divisors is an integer number (85956).

2^1387890 is an apocalyptic number.

1387890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387890 is an abundant number, since it is smaller than the sum of its proper divisors (2737998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1387890 is a wasteful number, since it uses less digits than its factorization.

1387890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223 (or 2220 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1387890 is about 1178.0874330881. The cubic root of 1387890 is about 111.5454043668.

The spelling of 1387890 in words is "one million, three hundred eighty-seven thousand, eight hundred ninety".