1296638 has 24 divisors (see below), whose sum is σ = 2302344. Its totient is φ = 546000.

The previous prime is 1296629. The next prime is 1296649. The reversal of 1296638 is 8366921.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1296598 and 1296607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9833 + ... + 9963.

It is an arithmetic number, because the mean of its divisors is an integer number (95931).

2^1296638 is an apocalyptic number.

1296638 is a deficient number, since it is larger than the sum of its proper divisors (1005706).

1296638 is a wasteful number, since it uses less digits than its factorization.

1296638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 241 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 1296638 is about 1138.7001361201. The cubic root of 1296638 is about 109.0451234210.

The spelling of 1296638 in words is "one million, two hundred ninety-six thousand, six hundred thirty-eight".