16691380 has 12 divisors (see below), whose sum is σ = 35051940. Its totient is φ = 6676544.

The previous prime is 16691371. The next prime is 16691401. The reversal of 16691380 is 8319661.

It can be written as a sum of positive squares in 2 ways, for example, as 2643876 + 14047504 = 1626^2 + 3748^2 .

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, 417265 + ... + 417304.

It is an arithmetic number, because the mean of its divisors is an integer number (2920995).

Almost surely, 2^16691380 is an apocalyptic number.

16691380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16691380 is an abundant number, since it is smaller than the sum of its proper divisors (18360560).

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

16691380 is a wasteful number, since it uses less digits than its factorization.

16691380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834578 (or 834576 counting only the distinct ones).

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

The square root of 16691380 is about 4085.5085362780. The cubic root of 16691380 is about 255.5626688491.

It can be divided in two parts, 16691 and 380, that added together give a palindrome (17071).

The spelling of 16691380 in words is "sixteen million, six hundred ninety-one thousand, three hundred eighty".