1521916 has 12 divisors (see below), whose sum is σ = 2905560. Its totient is φ = 691760.

The previous prime is 1521913. The next prime is 1521937. The reversal of 1521916 is 6191251.

It is a super-2 number, since 2×1521916² = 4632456622112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17251 + ... + 17338.

It is an arithmetic number, because the mean of its divisors is an integer number (242130).

2^1521916 is an apocalyptic number.

It is an amenable number.

1521916 is a deficient number, since it is larger than the sum of its proper divisors (1383644).

1521916 is a wasteful number, since it uses less digits than its factorization.

1521916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34604 (or 34602 counting only the distinct ones).

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

The square root of 1521916 is about 1233.6595964852. The cubic root of 1521916 is about 115.0262322011.

The spelling of 1521916 in words is "one million, five hundred twenty-one thousand, nine hundred sixteen".