1290997995 has 16 divisors (see below), whose sum is σ = 2360682240. Its totient is φ = 590170464.

The previous prime is 1290997963. The next prime is 1290997999. The reversal of 1290997995 is 5997990921.

It is not a de Polignac number, because 1290997995 - 2⁵ = 1290997963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1290997999) 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, 6147505 + ... + 6147714.

It is an arithmetic number, because the mean of its divisors is an integer number (147542640).

Almost surely, 2^1290997995 is an apocalyptic number.

1290997995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1290997995 is a deficient number, since it is larger than the sum of its proper divisors (1069684245).

1290997995 is a wasteful number, since it uses less digits than its factorization.

1290997995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12295234.

The product of its (nonzero) digits is 4133430, while the sum is 60.

The square root of 1290997995 is about 35930.4605453367. The cubic root of 1290997995 is about 1088.8678857978.

The spelling of 1290997995 in words is "one billion, two hundred ninety million, nine hundred ninety-seven thousand, nine hundred ninety-five".