1309887 has 6 divisors (see below), whose sum is σ = 1892072. Its totient is φ = 873252.

The previous prime is 1309883. The next prime is 1309907. The reversal of 1309887 is 7889031.

It is not a de Polignac number, because 1309887 - 2² = 1309883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72763 + ... + 72780.

2^1309887 is an apocalyptic number.

1309887 is a deficient number, since it is larger than the sum of its proper divisors (582185).

1309887 is a wasteful number, since it uses less digits than its factorization.

1309887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145549 (or 145546 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1309887 is about 1144.5029488822. The cubic root of 1309887 is about 109.4152719183.

The spelling of 1309887 in words is "one million, three hundred nine thousand, eight hundred eighty-seven".