15391216 has 40 divisors (see below), whose sum is σ = 31672080. Its totient is φ = 7225344.

The previous prime is 15391183. The next prime is 15391217. The reversal of 15391216 is 61219351.

15391216 = 91³ + 92³ + ... + 106³.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15391217) 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, 59760 + ... + 60016.

It is an arithmetic number, because the mean of its divisors is an integer number (791802).

Almost surely, 2^15391216 is an apocalyptic number.

15391216 is a gapful number since it is divisible by the number (16) 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 15391216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15836040).

15391216 is an abundant number, since it is smaller than the sum of its proper divisors (16280864).

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

15391216 is a wasteful number, since it uses less digits than its factorization.

15391216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 475 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 15391216 is about 3923.1640291989. The cubic root of 15391216 is about 248.7468812686.

It can be divided in two parts, 1539 and 1216, that multiplied together give a square (1871424 = 1368²).

The spelling of 15391216 in words is "fifteen million, three hundred ninety-one thousand, two hundred sixteen".