16819240 has 16 divisors (see below), whose sum is σ = 37843380. Its totient is φ = 6727680.

The previous prime is 16819219. The next prime is 16819241. The reversal of 16819240 is 4291861.

16819240 = 136² + 137² + ... + 375².

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15665764 + 1153476 = 3958^2 + 1074^2 .

It is not an unprimeable number, because it can be changed into a prime (16819241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210201 + ... + 210280.

Almost surely, 2^16819240 is an apocalyptic number.

16819240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16819240 is an abundant number, since it is smaller than the sum of its proper divisors (21024140).

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

16819240 is a wasteful number, since it uses less digits than its factorization.

16819240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420492 (or 420488 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 16819240 is about 4101.1266744640. The cubic root of 16819240 is about 256.2135669004.

The spelling of 16819240 in words is "sixteen million, eight hundred nineteen thousand, two hundred forty".