1521716 has 12 divisors (see below), whose sum is σ = 3043488. Its totient is φ = 652152.

The previous prime is 1521677. The next prime is 1521731. The reversal of 1521716 is 6171251.

1521716 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1521691 and 1521700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27146 + ... + 27201.

It is an arithmetic number, because the mean of its divisors is an integer number (253624).

2^1521716 is an apocalyptic number.

It is an amenable number.

1521716 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1521716 is a wasteful number, since it uses less digits than its factorization.

1521716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54358 (or 54356 counting only the distinct ones).

The product of its digits is 420, while the sum is 23.

The square root of 1521716 is about 1233.5785341842. The cubic root of 1521716 is about 115.0211933215.

Adding to 1521716 its reverse (6171251), we get a palindrome (7692967).

The spelling of 1521716 in words is "one million, five hundred twenty-one thousand, seven hundred sixteen".