16400475 has 120 divisors (see below), whose sum is σ = 37810080. Its totient is φ = 6842880.

The previous prime is 16400473. The next prime is 16400513. The reversal of 16400475 is 57400461.

16400475 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16400475 - 2¹ = 16400473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (16400473) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 184231 + ... + 184319.

It is an arithmetic number, because the mean of its divisors is an integer number (315084).

Almost surely, 2^16400475 is an apocalyptic number.

16400475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16400475 is an abundant number, since it is smaller than the sum of its proper divisors (21409605).

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

16400475 is a wasteful number, since it uses less digits than its factorization.

16400475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 16400475 is about 4049.7499922835. The cubic root of 16400475 is about 254.0692714117.

The spelling of 16400475 in words is "sixteen million, four hundred thousand, four hundred seventy-five".