15217140 has 48 divisors (see below), whose sum is σ = 42964992. Its totient is φ = 4023936.

The previous prime is 15217133. The next prime is 15217171. The reversal of 15217140 is 4171251.

It is a happy number.

15217140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15217140² = 463122699559200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6622 + ... + 8618.

It is an arithmetic number, because the mean of its divisors is an integer number (895104).

Almost surely, 2^15217140 is an apocalyptic number.

15217140 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 15217140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21482496).

15217140 is an abundant number, since it is smaller than the sum of its proper divisors (27747852).

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

15217140 is a wasteful number, since it uses less digits than its factorization.

15217140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2134 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 15217140 is about 3900.9152772138. The cubic root of 15217140 is about 247.8055404166.

Adding to 15217140 its reverse (4171251), we get a palindrome (19388391).

The spelling of 15217140 in words is "fifteen million, two hundred seventeen thousand, one hundred forty".