16439388 has 96 divisors (see below), whose sum is σ = 46792704. Its totient is φ = 4390848.

The previous prime is 16439387. The next prime is 16439399. The reversal of 16439388 is 88393461.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16439383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129381 + ... + 129507.

It is an arithmetic number, because the mean of its divisors is an integer number (487424).

Almost surely, 2^16439388 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 16439388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23396352).

16439388 is an abundant number, since it is smaller than the sum of its proper divisors (30353316).

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

16439388 is a wasteful number, since it uses less digits than its factorization.

16439388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 229 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 16439388 is about 4054.5515165059. The cubic root of 16439388 is about 254.2700539829.

The spelling of 16439388 in words is "sixteen million, four hundred thirty-nine thousand, three hundred eighty-eight".