16238640 has 80 divisors (see below), whose sum is σ = 54925056. Its totient is φ = 3936000.

The previous prime is 16238639. The next prime is 16238657. The reversal of 16238640 is 4683261.

16238640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 16238598 and 16238607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436 + ... + 5715.

Almost surely, 2^16238640 is an apocalyptic number.

16238640 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 16238640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27462528).

16238640 is an abundant number, since it is smaller than the sum of its proper divisors (38686416).

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

16238640 is a wasteful number, since it uses less digits than its factorization.

16238640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6178 (or 6172 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 16238640 is about 4029.7195932223. The cubic root of 16238640 is about 253.2308141659.

The spelling of 16238640 in words is "sixteen million, two hundred thirty-eight thousand, six hundred forty".