16155940 has 12 divisors (see below), whose sum is σ = 33927516. Its totient is φ = 6462368.

The previous prime is 16155901. The next prime is 16155941. The reversal of 16155940 is 4955161.

It can be written as a sum of positive squares in 2 ways, for example, as 10510564 + 5645376 = 3242^2 + 2376^2 .

It is a super-2 number, since 2×16155940² = 522028794567200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16155941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403879 + ... + 403918.

It is an arithmetic number, because the mean of its divisors is an integer number (2827293).

Almost surely, 2^16155940 is an apocalyptic number.

16155940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16155940 is an abundant number, since it is smaller than the sum of its proper divisors (17771576).

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

16155940 is a wasteful number, since it uses less digits than its factorization.

16155940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807806 (or 807804 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 16155940 is about 4019.4452353528. The cubic root of 16155940 is about 252.8001984523.

The spelling of 16155940 in words is "sixteen million, one hundred fifty-five thousand, nine hundred forty".