16721469 has 6 divisors (see below), whose sum is σ = 24153246. Its totient is φ = 11147640.

The previous prime is 16721461. The next prime is 16721473. The reversal of 16721469 is 96412761.

It can be written as a sum of positive squares in only one way, i.e., 16305444 + 416025 = 4038^2 + 645^2 .

It is not a de Polignac number, because 16721469 - 2³ = 16721461 is a prime.

It is a super-2 number, since 2×16721469² = 559215051035922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 928962 + ... + 928979.

It is an arithmetic number, because the mean of its divisors is an integer number (4025541).

Almost surely, 2^16721469 is an apocalyptic number.

It is an amenable number.

16721469 is a deficient number, since it is larger than the sum of its proper divisors (7431777).

16721469 is a wasteful number, since it uses less digits than its factorization.

16721469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857947 (or 1857944 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 16721469 is about 4089.1892839535. The cubic root of 16721469 is about 255.7161414630.

The spelling of 16721469 in words is "sixteen million, seven hundred twenty-one thousand, four hundred sixty-nine".