16681390 has 32 divisors (see below), whose sum is σ = 33022080. Its totient is φ = 6016800.

The previous prime is 16681363. The next prime is 16681397. The reversal of 16681390 is 9318661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14745 + ... + 15835.

It is an arithmetic number, because the mean of its divisors is an integer number (1031940).

Almost surely, 2^16681390 is an apocalyptic number.

16681390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16681390 is a deficient number, since it is larger than the sum of its proper divisors (16340690).

16681390 is a wasteful number, since it uses less digits than its factorization.

16681390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 16681390 is about 4084.2857392695. The cubic root of 16681390 is about 255.5116728544.

It can be divided in two parts, 16681 and 390, that added together give a palindrome (17071).

The spelling of 16681390 in words is "sixteen million, six hundred eighty-one thousand, three hundred ninety".