16401947 has 4 divisors (see below), whose sum is σ = 16506576. Its totient is φ = 16297320.

The previous prime is 16401943. The next prime is 16401977. The reversal of 16401947 is 74910461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74910461 = 1481 ⋅50581.

It is a cyclic number.

It is not a de Polignac number, because 16401947 - 2² = 16401943 is a prime.

It is a Duffinian 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, 52079 + ... + 52392.

It is an arithmetic number, because the mean of its divisors is an integer number (4126644).

Almost surely, 2^16401947 is an apocalyptic number.

16401947 is a deficient number, since it is larger than the sum of its proper divisors (104629).

16401947 is a wasteful number, since it uses less digits than its factorization.

16401947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104628.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 16401947 is about 4049.9317278196. The cubic root of 16401947 is about 254.0768723862.

The spelling of 16401947 in words is "sixteen million, four hundred one thousand, nine hundred forty-seven".