16439997 has 16 divisors (see below), whose sum is σ = 26370560. Its totient is φ = 8899632.

The previous prime is 16439993. The next prime is 16439999. The reversal of 16439997 is 79993461.

It is not a de Polignac number, because 16439997 - 2² = 16439993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16439993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20203 + ... + 21000.

It is an arithmetic number, because the mean of its divisors is an integer number (1648160).

Almost surely, 2^16439997 is an apocalyptic number.

It is an amenable number.

16439997 is a deficient number, since it is larger than the sum of its proper divisors (9930563).

16439997 is a wasteful number, since it uses less digits than its factorization.

16439997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41232.

The product of its digits is 367416, while the sum is 48.

The square root of 16439997 is about 4054.6266165949. The cubic root of 16439997 is about 254.2731937704.

The spelling of 16439997 in words is "sixteen million, four hundred thirty-nine thousand, nine hundred ninety-seven".