16180381 has 16 divisors (see below), whose sum is σ = 19576960. Its totient is φ = 13099968.

The previous prime is 16180369. The next prime is 16180391. The reversal of 16180381 is 18308161.

It is a happy number.

It is not a de Polignac number, because 16180381 - 2⁵ = 16180349 is a prime.

It is a super-2 number, since 2×16180381² = 523609458610322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16180321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47845 + ... + 48181.

It is an arithmetic number, because the mean of its divisors is an integer number (1223560).

Almost surely, 2^16180381 is an apocalyptic number.

It is an amenable number.

16180381 is a deficient number, since it is larger than the sum of its proper divisors (3396579).

16180381 is an frugal number, since it uses more digits than its factorization.

16180381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 16180381 is about 4022.4844312937. The cubic root of 16180381 is about 252.9276144681.

It can be divided in two parts, 16180 and 381, that added together give a palindrome (16561).

The spelling of 16180381 in words is "sixteen million, one hundred eighty thousand, three hundred eighty-one".