16401953 has 4 divisors (see below), whose sum is σ = 16449300. Its totient is φ = 16354608.

The previous prime is 16401943. The next prime is 16401977. The reversal of 16401953 is 35910461.

16401953 is nontrivially palindromic in base 12.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9935104 + 6466849 = 3152^2 + 2543^2 .

It is a cyclic number.

It is not a de Polignac number, because 16401953 - 2⁴ = 16401937 is a prime.

It is a Duffinian number.

It is a Curzon 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23150 + ... + 23847.

It is an arithmetic number, because the mean of its divisors is an integer number (4112325).

Almost surely, 2^16401953 is an apocalyptic number.

It is an amenable number.

16401953 is a deficient number, since it is larger than the sum of its proper divisors (47347).

16401953 is an equidigital number, since it uses as much as digits as its factorization.

16401953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47346.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 16401953 is about 4049.9324685728. The cubic root of 16401953 is about 254.0769033675.

The spelling of 16401953 in words is "sixteen million, four hundred one thousand, nine hundred fifty-three".