16555380 has 24 divisors (see below), whose sum is σ = 46355232. Its totient is φ = 4414752.

The previous prime is 16555373. The next prime is 16555381. The reversal of 16555380 is 8355561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16555381) 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, 137902 + ... + 138021.

It is an arithmetic number, because the mean of its divisors is an integer number (1931468).

Almost surely, 2^16555380 is an apocalyptic number.

16555380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16555380 is an abundant number, since it is smaller than the sum of its proper divisors (29799852).

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

16555380 is a wasteful number, since it uses less digits than its factorization.

16555380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275935 (or 275933 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 16555380 is about 4068.8302987468. The cubic root of 16555380 is about 254.8666738631.

The spelling of 16555380 in words is "sixteen million, five hundred fifty-five thousand, three hundred eighty".