16021439 has 8 divisors (see below), whose sum is σ = 18388128. Its totient is φ = 13674240.

The previous prime is 16021417. The next prime is 16021457. The reversal of 16021439 is 93412061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16021439 - 2¹² = 16017343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16021459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3062 + ... + 6435.

It is an arithmetic number, because the mean of its divisors is an integer number (2298516).

Almost surely, 2^16021439 is an apocalyptic number.

16021439 is a deficient number, since it is larger than the sum of its proper divisors (2366689).

16021439 is an equidigital number, since it uses as much as digits as its factorization.

16021439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9745.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 16021439 is about 4002.6789778847. The cubic root of 16021439 is about 252.0967074449.

The spelling of 16021439 in words is "sixteen million, twenty-one thousand, four hundred thirty-nine".