400487 has 4 divisors (see below), whose sum is σ = 409056. Its totient is φ = 391920.

The previous prime is 400481. The next prime is 400523. The reversal of 400487 is 784004.

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

It is a cyclic number.

It is not a de Polignac number, because 400487 - 2⁴ = 400471 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400481) 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, 4214 + ... + 4307.

It is an arithmetic number, because the mean of its divisors is an integer number (102264).

2⁴⁰⁰⁴⁸⁷ is an apocalyptic number.

400487 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

400487 is a deficient number, since it is larger than the sum of its proper divisors (8569).

400487 is an equidigital number, since it uses as much as digits as its factorization.

400487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8568.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 400487 is about 632.8404222235. The cubic root of 400487 is about 73.7105199014.

The spelling of 400487 in words is "four hundred thousand, four hundred eighty-seven".