16442538 has 24 divisors (see below), whose sum is σ = 38254752. Its totient is φ = 4697784.

The previous prime is 16442521. The next prime is 16442609. The reversal of 16442538 is 83524461.

It is a super-3 number, since 3×16442538³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16442499 and 16442508.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27670 + ... + 28257.

It is an arithmetic number, because the mean of its divisors is an integer number (1593948).

Almost surely, 2^16442538 is an apocalyptic number.

16442538 is an abundant number, since it is smaller than the sum of its proper divisors (21812214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16442538 is a wasteful number, since it uses less digits than its factorization.

16442538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55946 (or 55939 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 16442538 is about 4054.9399502335. The cubic root of 16442538 is about 254.2862934260.

Adding to 16442538 its reverse (83524461), we get a palindrome (99966999).

The spelling of 16442538 in words is "sixteen million, four hundred forty-two thousand, five hundred thirty-eight".