400686087 has 4 divisors (see below), whose sum is σ = 534248120. Its totient is φ = 267124056.

The previous prime is 400686053. The next prime is 400686119. The reversal of 400686087 is 780686004.

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

It is not a de Polignac number, because 400686087 - 2⁷ = 400685959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400686007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66781012 + ... + 66781017.

It is an arithmetic number, because the mean of its divisors is an integer number (133562030).

Almost surely, 2^400686087 is an apocalyptic number.

400686087 is a deficient number, since it is larger than the sum of its proper divisors (133562033).

400686087 is a wasteful number, since it uses less digits than its factorization.

400686087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133562032.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 400686087 is about 20017.1448263732. The cubic root of 400686087 is about 737.2273201257.

The spelling of 400686087 in words is "four hundred million, six hundred eighty-six thousand, eighty-seven".