16401087 has 12 divisors (see below), whose sum is σ = 23926344. Its totient is φ = 10825200.

The previous prime is 16401083. The next prime is 16401097. The reversal of 16401087 is 78010461.

It is a happy number.

16401087 is a `hidden beast` number, since 1 + 640 + 10 + 8 + 7 = 666.

It is not a de Polignac number, because 16401087 - 2² = 16401083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16401087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16401083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8113 + ... + 9930.

It is an arithmetic number, because the mean of its divisors is an integer number (1993862).

Almost surely, 2^16401087 is an apocalyptic number.

16401087 is a deficient number, since it is larger than the sum of its proper divisors (7525257).

16401087 is a wasteful number, since it uses less digits than its factorization.

16401087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18150 (or 18147 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 16401087 is about 4049.8255517985. The cubic root of 16401087 is about 254.0724316547.

The spelling of 16401087 in words is "sixteen million, four hundred one thousand, eighty-seven".