16261440 has 112 divisors (see below), whose sum is σ = 55644288. Its totient is φ = 3999744.

The previous prime is 16261411. The next prime is 16261447. The reversal of 16261440 is 4416261.

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 16261440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16261447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11829 + ... + 13131.

It is an arithmetic number, because the mean of its divisors is an integer number (496824).

Almost surely, 2^16261440 is an apocalyptic number.

16261440 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 16261440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27822144).

16261440 is an abundant number, since it is smaller than the sum of its proper divisors (39382848).

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

16261440 is a wasteful number, since it uses less digits than its factorization.

16261440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 1326 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 16261440 is about 4032.5475818643. The cubic root of 16261440 is about 253.3492756972.

The spelling of 16261440 in words is "sixteen million, two hundred sixty-one thousand, four hundred forty".