1523987 has 2 divisors, whose sum is σ = 1523988. Its totient is φ = 1523986.

The previous prime is 1523983. The next prime is 1524007. The reversal of 1523987 is 7893251.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1523987 - 2² = 1523983 is a prime.

It is not a weakly prime, because it can be changed into another prime (1523981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761993 + 761994.

It is an arithmetic number, because the mean of its divisors is an integer number (761994).

2^1523987 is an apocalyptic number.

1523987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1523987 is an equidigital number, since it uses as much as digits as its factorization.

1523987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 1523987 is about 1234.4986836769. The cubic root of 1523987 is about 115.0783838646.

The spelling of 1523987 in words is "one million, five hundred twenty-three thousand, nine hundred eighty-seven".