16400878 has 8 divisors (see below), whose sum is σ = 26493768. Its totient is φ = 7569624.

The previous prime is 16400851. The next prime is 16400927. The reversal of 16400878 is 87800461.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315376 + ... + 315427.

It is an arithmetic number, because the mean of its divisors is an integer number (3311721).

Almost surely, 2^16400878 is an apocalyptic number.

16400878 is a deficient number, since it is larger than the sum of its proper divisors (10092890).

16400878 is a wasteful number, since it uses less digits than its factorization.

16400878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630818.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 16400878 is about 4049.7997481357. The cubic root of 16400878 is about 254.0713524302.

The spelling of 16400878 in words is "sixteen million, four hundred thousand, eight hundred seventy-eight".