16440253 has 2 divisors, whose sum is σ = 16440254. Its totient is φ = 16440252.

The previous prime is 16440251. The next prime is 16440283. The reversal of 16440253 is 35204461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16297369 + 142884 = 4037^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 16440253 - 2¹ = 16440251 is a prime.

It is a super-3 number, since 3×16440253³ (a number of 23 digits) contains 333 as substring.

Together with 16440251, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16440251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8220126 + 8220127.

It is an arithmetic number, because the mean of its divisors is an integer number (8220127).

Almost surely, 2^16440253 is an apocalyptic number.

It is an amenable number.

16440253 is a deficient number, since it is larger than the sum of its proper divisors (1).

16440253 is an equidigital number, since it uses as much as digits as its factorization.

16440253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 16440253 is about 4054.6581853468. The cubic root of 16440253 is about 254.2745135922.

The spelling of 16440253 in words is "sixteen million, four hundred forty thousand, two hundred fifty-three".