16540381 has 32 divisors (see below), whose sum is σ = 20901888. Its totient is φ = 12872640.

The previous prime is 16540367. The next prime is 16540387. The reversal of 16540381 is 18304561.

It is not a de Polignac number, because 16540381 - 2⁷ = 16540253 is a prime.

It is a super-2 number, since 2×16540381² = 547168407250322, 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 (16540387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154530 + ... + 154636.

It is an arithmetic number, because the mean of its divisors is an integer number (653184).

Almost surely, 2^16540381 is an apocalyptic number.

16540381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16540381 is a deficient number, since it is larger than the sum of its proper divisors (4361507).

16540381 is a wasteful number, since it uses less digits than its factorization.

16540381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 16540381 is about 4066.9867223781. The cubic root of 16540381 is about 254.7896817659.

The spelling of 16540381 in words is "sixteen million, five hundred forty thousand, three hundred eighty-one".