16499940 has 72 divisors (see below), whose sum is σ = 47591040. Its totient is φ = 4270656.

The previous prime is 16499939. The next prime is 16499957. The reversal of 16499940 is 4999461.

It is a junction number, because it is equal to n+sod(n) for n = 16499892 and 16499901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208821 + ... + 208899.

Almost surely, 2^16499940 is an apocalyptic number.

16499940 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 16499940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23795520).

16499940 is an abundant number, since it is smaller than the sum of its proper divisors (31091100).

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

16499940 is a wasteful number, since it uses less digits than its factorization.

16499940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 16499940 is about 4062.0118168218. The cubic root of 16499940 is about 254.5818598982.

The spelling of 16499940 in words is "sixteen million, four hundred ninety-nine thousand, nine hundred forty".