1306631403 has 120 divisors (see below), whose sum is σ = 2516866560. Its totient is φ = 646541280.

The previous prime is 1306631399. The next prime is 1306631429. The reversal of 1306631403 is 3041366031.

It is not a de Polignac number, because 1306631403 - 2² = 1306631399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1306631003) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 5466958 + ... + 5467196.

It is an arithmetic number, because the mean of its divisors is an integer number (20973888).

Almost surely, 2^1306631403 is an apocalyptic number.

1306631403 is a deficient number, since it is larger than the sum of its proper divisors (1210235157).

1306631403 is a wasteful number, since it uses less digits than its factorization.

1306631403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 1306631403 is about 36147.3567913340. The cubic root of 1306631403 is about 1093.2454970355.

Adding to 1306631403 its reverse (3041366031), we get a palindrome (4347997434).

The spelling of 1306631403 in words is "one billion, three hundred six million, six hundred thirty-one thousand, four hundred three".