400287881 has 8 divisors (see below), whose sum is σ = 457703040. Its totient is φ = 342930528.

The previous prime is 400287857. The next prime is 400287887. The reversal of 400287881 is 188782004.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400287881 is a prime.

It is a super-2 number, since 2×400287881² = 320460775350940322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400287887) 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 7 ways as a sum of consecutive naturals, for example, 1580 + ... + 28338.

It is an arithmetic number, because the mean of its divisors is an integer number (57212880).

Almost surely, 2^400287881 is an apocalyptic number.

It is an amenable number.

400287881 is a deficient number, since it is larger than the sum of its proper divisors (57415159).

400287881 is a wasteful number, since it uses less digits than its factorization.

400287881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28903.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 400287881 is about 20007.1957305366. The cubic root of 400287881 is about 736.9830177854.

The spelling of 400287881 in words is "four hundred million, two hundred eighty-seven thousand, eight hundred eighty-one".