1306903987 has 4 divisors (see below), whose sum is σ = 1338779736. Its totient is φ = 1275028240.

The previous prime is 1306903957. The next prime is 1306903991. The reversal of 1306903987 is 7893096031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1306903987 - 2¹⁹ = 1306379699 is a prime.

It is a super-3 number, since 3×1306903987³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1306903957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15937813 + ... + 15937894.

It is an arithmetic number, because the mean of its divisors is an integer number (334694934).

Almost surely, 2^1306903987 is an apocalyptic number.

1306903987 is a deficient number, since it is larger than the sum of its proper divisors (31875749).

1306903987 is an equidigital number, since it uses as much as digits as its factorization.

1306903987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31875748.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 1306903987 is about 36151.1270502041. The cubic root of 1306903987 is about 1093.3215145233.

The spelling of 1306903987 in words is "one billion, three hundred six million, nine hundred three thousand, nine hundred eighty-seven".