1915216 has 10 divisors (see below), whose sum is σ = 3710762. Its totient is φ = 957600.

The previous prime is 1915213. The next prime is 1915223. The reversal of 1915216 is 6125191.

1915216 = 91² + 92² + ... + 186².

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 10816 = 1380^2 + 104^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1915213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59835 + ... + 59866.

2^1915216 is an apocalyptic number.

1915216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1915216 is a deficient number, since it is larger than the sum of its proper divisors (1795546).

1915216 is a wasteful number, since it uses less digits than its factorization.

1915216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119709 (or 119703 counting only the distinct ones).

The product of its digits is 540, while the sum is 25.

The square root of 1915216 is about 1383.9132920816. The cubic root of 1915216 is about 124.1859852129.

Subtracting from 1915216 its sum of digits (25), we obtain a palindrome (1915191).

The spelling of 1915216 in words is "one million, nine hundred fifteen thousand, two hundred sixteen".