16401949 has 4 divisors (see below), whose sum is σ = 16493760. Its totient is φ = 16310140.

The previous prime is 16401943. The next prime is 16401977. The reversal of 16401949 is 94910461.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16401949 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 (16401943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45637 + ... + 45994.

It is an arithmetic number, because the mean of its divisors is an integer number (4123440).

Almost surely, 2^16401949 is an apocalyptic number.

It is an amenable number.

16401949 is a deficient number, since it is larger than the sum of its proper divisors (91811).

16401949 is an equidigital number, since it uses as much as digits as its factorization.

16401949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91810.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 16401949 is about 4049.9319747374. The cubic root of 16401949 is about 254.0768827133.

The spelling of 16401949 in words is "sixteen million, four hundred one thousand, nine hundred forty-nine".