1323687906 has 20 divisors (see below), whose sum is σ = 2966041782. Its totient is φ = 441229248.

The previous prime is 1323687889. The next prime is 1323687923. The reversal of 1323687906 is 6097863231.

It is an interprime number because it is at equal distance from previous prime (1323687889) and next prime (1323687923).

It can be written as a sum of positive squares in only one way, i.e., 704424681 + 619263225 = 26541^2 + 24885^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4085295 + ... + 4085618.

Almost surely, 2^1323687906 is an apocalyptic number.

1323687906 is an abundant number, since it is smaller than the sum of its proper divisors (1642353876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1323687906 is an equidigital number, since it uses as much as digits as its factorization.

1323687906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8170927 (or 8170918 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1323687906 is about 36382.5219851511. The cubic root of 1323687906 is about 1097.9819490000.

The spelling of 1323687906 in words is "one billion, three hundred twenty-three million, six hundred eighty-seven thousand, nine hundred six".