1296649623 has 16 divisors (see below), whose sum is σ = 1830769920. Its totient is φ = 814026816.

The previous prime is 1296649591. The next prime is 1296649637. The reversal of 1296649623 is 3269466921.

It is not a de Polignac number, because 1296649623 - 2⁵ = 1296649591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296649643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58590 + ... + 77627.

It is an arithmetic number, because the mean of its divisors is an integer number (114423120).

Almost surely, 2^1296649623 is an apocalyptic number.

1296649623 is a deficient number, since it is larger than the sum of its proper divisors (534120297).

1296649623 is a wasteful number, since it uses less digits than its factorization.

1296649623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136406.

The product of its digits is 839808, while the sum is 48.

The square root of 1296649623 is about 36009.0214113075. The cubic root of 1296649623 is about 1090.4544924512.

The spelling of 1296649623 in words is "one billion, two hundred ninety-six million, six hundred forty-nine thousand, six hundred twenty-three".