16261638 has 8 divisors (see below), whose sum is σ = 32523288. Its totient is φ = 5420544.

The previous prime is 16261633. The next prime is 16261649. The reversal of 16261638 is 83616261.

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

16261638 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16261599 and 16261608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16261633) 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, 1355131 + ... + 1355142.

It is an arithmetic number, because the mean of its divisors is an integer number (4065411).

Almost surely, 2^16261638 is an apocalyptic number.

16261638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16261638 is a wasteful number, since it uses less digits than its factorization.

16261638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2710278.

The product of its digits is 10368, while the sum is 33.

The square root of 16261638 is about 4032.5721320269. The cubic root of 16261638 is about 253.3503039570.

Adding to 16261638 its reverse (83616261), we get a palindrome (99877899).

The spelling of 16261638 in words is "sixteen million, two hundred sixty-one thousand, six hundred thirty-eight".