1290387 has 16 divisors (see below), whose sum is σ = 2013440. Its totient is φ = 719712.

The previous prime is 1290379. The next prime is 1290427. The reversal of 1290387 is 7830921.

It is a happy number.

It is not a de Polignac number, because 1290387 - 2³ = 1290379 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

1290387 is a modest number, since divided by 387 gives 129 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1290287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189 + ... + 1617.

It is an arithmetic number, because the mean of its divisors is an integer number (125840).

2^1290387 is an apocalyptic number.

1290387 is a deficient number, since it is larger than the sum of its proper divisors (723053).

1290387 is a wasteful number, since it uses less digits than its factorization.

1290387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1290387 is about 1135.9520236348. The cubic root of 1290387 is about 108.8696081292.

The spelling of 1290387 in words is "one million, two hundred ninety thousand, three hundred eighty-seven".