16277993 has 4 divisors (see below), whose sum is σ = 17235540. Its totient is φ = 15320448.

The previous prime is 16277981. The next prime is 16277999. The reversal of 16277993 is 39977261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39977261 = 3083 ⋅12967.

It can be written as a sum of positive squares in 2 ways, for example, as 6210064 + 10067929 = 2492^2 + 3173^2 .

It is a cyclic number.

It is not a de Polignac number, because 16277993 - 2²² = 12083689 is a prime.

It is a super-2 number, since 2×16277993² = 529946112216098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16277999) 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, 478748 + ... + 478781.

It is an arithmetic number, because the mean of its divisors is an integer number (4308885).

Almost surely, 2^16277993 is an apocalyptic number.

It is an amenable number.

16277993 is a deficient number, since it is larger than the sum of its proper divisors (957547).

16277993 is an equidigital number, since it uses as much as digits as its factorization.

16277993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957546.

The product of its digits is 142884, while the sum is 44.

The square root of 16277993 is about 4034.5994844594. The cubic root of 16277993 is about 253.4352104485.

The spelling of 16277993 in words is "sixteen million, two hundred seventy-seven thousand, nine hundred ninety-three".