1390987 has 8 divisors (see below), whose sum is σ = 1521296. Its totient is φ = 1264032.

The previous prime is 1390979. The next prime is 1390993. The reversal of 1390987 is 7890931.

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 1390987 - 2³ = 1390979 is a prime.

It is a Duffinian number.

1390987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1390937) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 73 + ... + 1669.

It is an arithmetic number, because the mean of its divisors is an integer number (190162).

2^1390987 is an apocalyptic number.

1390987 is a deficient number, since it is larger than the sum of its proper divisors (130309).

1390987 is a wasteful number, since it uses less digits than its factorization.

1390987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1390987 is about 1179.4011192126. The cubic root of 1390987 is about 111.6283118690.

The spelling of 1390987 in words is "one million, three hundred ninety thousand, nine hundred eighty-seven".