400086987 has 8 divisors (see below), whose sum is σ = 551844240. Its totient is φ = 257527200.

The previous prime is 400086977. The next prime is 400086997. The reversal of 400086987 is 789680004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400086977) and next prime (400086997).

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

It is not a de Polignac number, because 400086987 - 2⁷ = 400086859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400086977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2299264 + ... + 2299437.

It is an arithmetic number, because the mean of its divisors is an integer number (68980530).

Almost surely, 2^400086987 is an apocalyptic number.

400086987 is a deficient number, since it is larger than the sum of its proper divisors (151757253).

400086987 is a wasteful number, since it uses less digits than its factorization.

400086987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4598733.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 400086987 is about 20002.1745567826. The cubic root of 400086987 is about 736.8597063315.

The spelling of 400086987 in words is "four hundred million, eighty-six thousand, nine hundred eighty-seven".