16749940 has 12 divisors (see below), whose sum is σ = 35174916. Its totient is φ = 6699968.

The previous prime is 16749899. The next prime is 16749949. The reversal of 16749940 is 4994761.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5740816 + 11009124 = 2396^2 + 3318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16749893 and 16749902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16749949) 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, 418729 + ... + 418768.

It is an arithmetic number, because the mean of its divisors is an integer number (2931243).

Almost surely, 2^16749940 is an apocalyptic number.

16749940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16749940 is an abundant number, since it is smaller than the sum of its proper divisors (18424976).

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

16749940 is a wasteful number, since it uses less digits than its factorization.

16749940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837506 (or 837504 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 16749940 is about 4092.6690557630. The cubic root of 16749940 is about 255.8611918390.

It can be divided in two parts, 16749 and 940, that added together give a square (17689 = 133²).

The spelling of 16749940 in words is "sixteen million, seven hundred forty-nine thousand, nine hundred forty".