16243240 has 32 divisors (see below), whose sum is σ = 39359880. Its totient is φ = 5997312.

The previous prime is 16243229. The next prime is 16243273. The reversal of 16243240 is 4234261.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13264164 + 2979076 = 3642^2 + 1726^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15099 + ... + 16138.

Almost surely, 2^16243240 is an apocalyptic number.

16243240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16243240 is an abundant number, since it is smaller than the sum of its proper divisors (23116640).

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

16243240 is a wasteful number, since it uses less digits than its factorization.

16243240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31261 (or 31257 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 16243240 is about 4030.2903121239. The cubic root of 16243240 is about 253.2547232242.

The spelling of 16243240 in words is "sixteen million, two hundred forty-three thousand, two hundred forty".