16397949 has 4 divisors (see below), whose sum is σ = 21863936. Its totient is φ = 10931964.

The previous prime is 16397933. The next prime is 16397981. The reversal of 16397949 is 94979361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94979361 = 3 ⋅31659787.

It is not a de Polignac number, because 16397949 - 2⁴ = 16397933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16397898 and 16397907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16397989) 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, 2732989 + ... + 2732994.

It is an arithmetic number, because the mean of its divisors is an integer number (5465984).

Almost surely, 2^16397949 is an apocalyptic number.

It is an amenable number.

16397949 is a deficient number, since it is larger than the sum of its proper divisors (5465987).

16397949 is an equidigital number, since it uses as much as digits as its factorization.

16397949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465986.

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

The square root of 16397949 is about 4049.4381091702. The cubic root of 16397949 is about 254.0562268315.

The spelling of 16397949 in words is "sixteen million, three hundred ninety-seven thousand, nine hundred forty-nine".