1521387 has 48 divisors (see below), whose sum is σ = 2795520. Its totient is φ = 777600.

The previous prime is 1521371. The next prime is 1521391. The reversal of 1521387 is 7831251.

It is not a de Polignac number, because 1521387 - 2⁴ = 1521371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1521387.

It is not an unprimeable number, because it can be changed into a prime (1521337) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37087 + ... + 37127.

It is an arithmetic number, because the mean of its divisors is an integer number (58240).

2^1521387 is an apocalyptic number.

1521387 is a deficient number, since it is larger than the sum of its proper divisors (1274133).

1521387 is a wasteful number, since it uses less digits than its factorization.

1521387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 101 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1521387 is about 1233.4451751091. The cubic root of 1521387 is about 115.0129034041.

The spelling of 1521387 in words is "one million, five hundred twenty-one thousand, three hundred eighty-seven".