16400055 has 48 divisors (see below), whose sum is σ = 31173984. Its totient is φ = 7338240.

The previous prime is 16400047. The next prime is 16400093. The reversal of 16400055 is 55000461.

It is a happy number.

It is not a de Polignac number, because 16400055 - 2³ = 16400047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38745 + ... + 39165.

It is an arithmetic number, because the mean of its divisors is an integer number (649458).

Almost surely, 2^16400055 is an apocalyptic number.

16400055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16400055 is a deficient number, since it is larger than the sum of its proper divisors (14773929).

16400055 is a wasteful number, since it uses less digits than its factorization.

16400055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 16400055 is about 4049.6981368986. The cubic root of 16400055 is about 254.0671025720.

The spelling of 16400055 in words is "sixteen million, four hundred thousand, fifty-five".