10400087 has 4 divisors (see below), whose sum is σ = 10947480. Its totient is φ = 9852696.

The previous prime is 10400077. The next prime is 10400123. The reversal of 10400087 is 78000401.

It is a happy number.

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 10400087 - 2¹⁰ = 10399063 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 (10400057) 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, 273668 + ... + 273705.

It is an arithmetic number, because the mean of its divisors is an integer number (2736870).

Almost surely, 2^10400087 is an apocalyptic number.

10400087 is a deficient number, since it is larger than the sum of its proper divisors (547393).

10400087 is an equidigital number, since it uses as much as digits as its factorization.

10400087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547392.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 10400087 is about 3224.9165880686. The cubic root of 10400087 is about 218.2791852719.

Adding to 10400087 its reverse (78000401), we get a palindrome (88400488).

The spelling of 10400087 in words is "ten million, four hundred thousand, eighty-seven".