14991220 has 24 divisors (see below), whose sum is σ = 31626504. Its totient is φ = 5968896.

The previous prime is 14991191. The next prime is 14991227. The reversal of 14991220 is 2219941.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2232036 + 12759184 = 1494^2 + 3572^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14991227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3052 + ... + 6268.

It is an arithmetic number, because the mean of its divisors is an integer number (1317771).

Almost surely, 2^14991220 is an apocalyptic number.

14991220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

14991220 is an abundant number, since it is smaller than the sum of its proper divisors (16635284).

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

14991220 is a wasteful number, since it uses less digits than its factorization.

14991220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3459 (or 3457 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 14991220 is about 3871.8496871650. The cubic root of 14991220 is about 246.5730795037.

The spelling of 14991220 in words is "fourteen million, nine hundred ninety-one thousand, two hundred twenty".