16401263 has 8 divisors (see below), whose sum is σ = 16993920. Its totient is φ = 15812640.

The previous prime is 16401257. The next prime is 16401283. The reversal of 16401263 is 36210461.

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 not a de Polignac number, because 16401263 - 2¹² = 16397167 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 (16401283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8993 + ... + 10661.

It is an arithmetic number, because the mean of its divisors is an integer number (2124240).

Almost surely, 2^16401263 is an apocalyptic number.

16401263 is a deficient number, since it is larger than the sum of its proper divisors (592657).

16401263 is a wasteful number, since it uses less digits than its factorization.

16401263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 16401263 is about 4049.8472810712. The cubic root of 16401263 is about 254.0733404682.

The spelling of 16401263 in words is "sixteen million, four hundred one thousand, two hundred sixty-three".