1391985 has 40 divisors (see below), whose sum is σ = 2857536. Its totient is φ = 635040.

The previous prime is 1391981. The next prime is 1391989. The reversal of 1391985 is 5891931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1391981) and next prime (1391989).

It is not a de Polignac number, because 1391985 - 2² = 1391981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1391981) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2590 + ... + 3080.

2^1391985 is an apocalyptic number.

1391985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1391985 is an abundant number, since it is smaller than the sum of its proper divisors (1465551).

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

1391985 is an equidigital number, since it uses as much as digits as its factorization.

1391985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 506 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1391985 is about 1179.8241394377. The cubic root of 1391985 is about 111.6550023707.

The spelling of 1391985 in words is "one million, three hundred ninety-one thousand, nine hundred eighty-five".