1305987 has 8 divisors (see below), whose sum is σ = 1749840. Its totient is φ = 866400.

The previous prime is 1305971. The next prime is 1306001. The reversal of 1305987 is 7895031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1305987 - 2⁴ = 1305971 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1305907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264 + ... + 1637.

It is an arithmetic number, because the mean of its divisors is an integer number (218730).

2^1305987 is an apocalyptic number.

1305987 is a deficient number, since it is larger than the sum of its proper divisors (443853).

1305987 is a wasteful number, since it uses less digits than its factorization.

1305987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 1305987 is about 1142.7978823922. The cubic root of 1305987 is about 109.3065745622.

The spelling of 1305987 in words is "one million, three hundred five thousand, nine hundred eighty-seven".