16400554 has 8 divisors (see below), whose sum is σ = 24681888. Its totient is φ = 8173260.

The previous prime is 16400539. The next prime is 16400567. The reversal of 16400554 is 45500461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 12742 + ... + 13969.

It is an arithmetic number, because the mean of its divisors is an integer number (3085236).

Almost surely, 2^16400554 is an apocalyptic number.

16400554 is a deficient number, since it is larger than the sum of its proper divisors (8281334).

16400554 is a wasteful number, since it uses less digits than its factorization.

16400554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27020.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 16400554 is about 4049.7597459602. The cubic root of 16400554 is about 254.0696793560.

The spelling of 16400554 in words is "sixteen million, four hundred thousand, five hundred fifty-four".