16993746 has 128 divisors (see below), whose sum is σ = 48568320. Its totient is φ = 4276800.

The previous prime is 16993741. The next prime is 16993747. The reversal of 16993746 is 64739961.

It is a super-2 number, since 2×16993746² = 577574806225032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16993741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 253605 + ... + 253671.

It is an arithmetic number, because the mean of its divisors is an integer number (379440).

Almost surely, 2^16993746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16993746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24284160).

16993746 is an abundant number, since it is smaller than the sum of its proper divisors (31574574).

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

16993746 is a wasteful number, since it uses less digits than its factorization.

16993746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 151 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 16993746 is about 4122.3471469540. The cubic root of 16993746 is about 257.0966242277.

It can be divided in two parts, 1699 and 3746, that added together give a palindrome (5445).

The spelling of 16993746 in words is "sixteen million, nine hundred ninety-three thousand, seven hundred forty-six".