16997940 has 36 divisors (see below), whose sum is σ = 51560964. Its totient is φ = 4532736.

The previous prime is 16997921. The next prime is 16997947. The reversal of 16997940 is 4979961.

It can be written as a sum of positive squares in 2 ways, for example, as 5788836 + 11209104 = 2406^2 + 3348^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16997947) 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 11 ways as a sum of consecutive naturals, for example, 47037 + ... + 47396.

It is an arithmetic number, because the mean of its divisors is an integer number (1432249).

Almost surely, 2^16997940 is an apocalyptic number.

16997940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16997940 is an abundant number, since it is smaller than the sum of its proper divisors (34563024).

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

16997940 is a wasteful number, since it uses less digits than its factorization.

16997940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94448 (or 94443 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 16997940 is about 4122.8558063556. The cubic root of 16997940 is about 257.1177726853.

The spelling of 16997940 in words is "sixteen million, nine hundred ninety-seven thousand, nine hundred forty".