1393987 has 8 divisors (see below), whose sum is σ = 1610336. Its totient is φ = 1181952.

The previous prime is 1393981. The next prime is 1393991. The reversal of 1393987 is 7893931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1393987 - 2³ = 1393979 is a prime.

1393987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1393981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348 + ... + 1705.

It is an arithmetic number, because the mean of its divisors is an integer number (201292).

2^1393987 is an apocalyptic number.

1393987 is a deficient number, since it is larger than the sum of its proper divisors (216349).

1393987 is an equidigital number, since it uses as much as digits as its factorization.

1393987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157.

The product of its digits is 40824, while the sum is 40.

The square root of 1393987 is about 1180.6722661264. The cubic root of 1393987 is about 111.7085053983.

The spelling of 1393987 in words is "one million, three hundred ninety-three thousand, nine hundred eighty-seven".