16311840 has 96 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 4091904.

The previous prime is 16311821. The next prime is 16311851. The reversal of 16311840 is 4811361.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×16311840² = 532152248371200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 16311840.

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 15 ways as a sum of consecutive naturals, for example, 7161 + ... + 9159.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^16311840 is an apocalyptic number.

16311840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16311840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27216000).

16311840 is an abundant number, since it is smaller than the sum of its proper divisors (38120160).

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

16311840 is a wasteful number, since it uses less digits than its factorization.

16311840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034 (or 2026 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 16311840 is about 4038.7918985756. The cubic root of 16311840 is about 253.6107456628.

The spelling of 16311840 in words is "sixteen million, three hundred eleven thousand, eight hundred forty".