16651240 has 16 divisors (see below), whose sum is σ = 37465380. Its totient is φ = 6660480.

The previous prime is 16651237. The next prime is 16651253. The reversal of 16651240 is 4215661.

It can be written as a sum of positive squares in 2 ways, for example, as 15225604 + 1425636 = 3902^2 + 1194^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208101 + ... + 208180.

Almost surely, 2^16651240 is an apocalyptic number.

16651240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16651240 is an abundant number, since it is smaller than the sum of its proper divisors (20814140).

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

16651240 is a wasteful number, since it uses less digits than its factorization.

16651240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416292 (or 416288 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 16651240 is about 4080.5930941470. The cubic root of 16651240 is about 255.3576424684.

It can be divided in two parts, 1 and 6651240, that added together give a square (6651241 = 2579²).

The spelling of 16651240 in words is "sixteen million, six hundred fifty-one thousand, two hundred forty".