16427431 has 4 divisors (see below), whose sum is σ = 16435552. Its totient is φ = 16419312.

The previous prime is 16427417. The next prime is 16427449. The reversal of 16427431 is 13472461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13472461 = 997 ⋅13513.

It is a cyclic number.

It is not a de Polignac number, because 16427431 - 2⁹ = 16426919 is a prime.

It is a super-2 number, since 2×16427431² = 539720978519522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16427431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16427401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1675 + ... + 5971.

It is an arithmetic number, because the mean of its divisors is an integer number (4108888).

Almost surely, 2^16427431 is an apocalyptic number.

16427431 is a deficient number, since it is larger than the sum of its proper divisors (8121).

16427431 is an equidigital number, since it uses as much as digits as its factorization.

16427431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8120.

The product of its digits is 4032, while the sum is 28.

The square root of 16427431 is about 4053.0767325576. The cubic root of 16427431 is about 254.2083922300.

Adding to 16427431 its reverse (13472461), we get a palindrome (29899892).

The spelling of 16427431 in words is "sixteen million, four hundred twenty-seven thousand, four hundred thirty-one".