16400553 has 16 divisors (see below), whose sum is σ = 24790080. Its totient is φ = 9561024.

The previous prime is 16400539. The next prime is 16400567. The reversal of 16400553 is 35500461.

It is an interprime number because it is at equal distance from previous prime (16400539) and next prime (16400567).

It is not a de Polignac number, because 16400553 - 2¹³ = 16392361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16400513) 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 15 ways as a sum of consecutive naturals, for example, 10326 + ... + 11807.

It is an arithmetic number, because the mean of its divisors is an integer number (1549380).

Almost surely, 2^16400553 is an apocalyptic number.

16400553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16400553 is a deficient number, since it is larger than the sum of its proper divisors (8389527).

16400553 is a wasteful number, since it uses less digits than its factorization.

16400553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22168.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 16400553 is about 4049.7596224961. The cubic root of 16400553 is about 254.0696741921.

The spelling of 16400553 in words is "sixteen million, four hundred thousand, five hundred fifty-three".