403987 has 4 divisors (see below), whose sum is σ = 407296. Its totient is φ = 400680.

The previous prime is 403981. The next prime is 403993. The reversal of 403987 is 789304.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (403981) and next prime (403993).

It is a cyclic number.

It is not a de Polignac number, because 403987 - 2³ = 403979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (403981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1464 + ... + 1717.

It is an arithmetic number, because the mean of its divisors is an integer number (101824).

2⁴⁰³⁹⁸⁷ is an apocalyptic number.

403987 is a deficient number, since it is larger than the sum of its proper divisors (3309).

403987 is a wasteful number, since it uses less digits than its factorization.

403987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3308.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 403987 is about 635.5997168030. The cubic root of 403987 is about 73.9246249792.

The spelling of 403987 in words is "four hundred three thousand, nine hundred eighty-seven".