1295999997 has 4 divisors (see below), whose sum is σ = 1728000000. Its totient is φ = 863999996.

The previous prime is 1295999987. The next prime is 1296000011. The reversal of 1295999997 is 7999995921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1295999997 - 2¹¹ = 1295997949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1295999927) 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, 215999997 + ... + 216000002.

It is an arithmetic number, because the mean of its divisors is an integer number (432000000).

Almost surely, 2^1295999997 is an apocalyptic number.

It is an amenable number.

1295999997 is a deficient number, since it is larger than the sum of its proper divisors (432000003).

1295999997 is an equidigital number, since it uses as much as digits as its factorization.

1295999997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432000002.

The product of its digits is 37200870, while the sum is 69.

The square root of 1295999997 is about 35999.9999583333. Note that the first 4 decimals coincide. The cubic root of 1295999997 is about 1090.2723548580.

The spelling of 1295999997 in words is "one billion, two hundred ninety-five million, nine hundred ninety-nine thousand, nine hundred ninety-seven".