16400072 has 32 divisors (see below), whose sum is σ = 33458880. Its totient is φ = 7490880.

The previous prime is 16400047. The next prime is 16400093. The reversal of 16400072 is 27000461.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9947 + ... + 11477.

It is an arithmetic number, because the mean of its divisors is an integer number (1045590).

Almost surely, 2^16400072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16400072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16729440).

16400072 is an abundant number, since it is smaller than the sum of its proper divisors (17058808).

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

16400072 is a wasteful number, since it uses less digits than its factorization.

16400072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653 (or 1649 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 16400072 is about 4049.7002358199. The cubic root of 16400072 is about 254.0671903591.

The spelling of 16400072 in words is "sixteen million, four hundred thousand, seventy-two".