16740391 has 4 divisors (see below), whose sum is σ = 17192872. Its totient is φ = 16287912.

The previous prime is 16740377. The next prime is 16740401. The reversal of 16740391 is 19304761.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16740391 - 2¹¹ = 16738343 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16740301) 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, 226185 + ... + 226258.

It is an arithmetic number, because the mean of its divisors is an integer number (4298218).

Almost surely, 2^16740391 is an apocalyptic number.

16740391 is a deficient number, since it is larger than the sum of its proper divisors (452481).

16740391 is an equidigital number, since it uses as much as digits as its factorization.

16740391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452480.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 16740391 is about 4091.5022913351. The cubic root of 16740391 is about 255.8125611582.

The spelling of 16740391 in words is "sixteen million, seven hundred forty thousand, three hundred ninety-one".