1290275391 has 8 divisors (see below), whose sum is σ = 1726447360. Its totient is φ = 857143512.

The previous prime is 1290275387. The next prime is 1290275419. The reversal of 1290275391 is 1935720921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1290275391 - 2² = 1290275387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290275341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 759031 + ... + 760728.

It is an arithmetic number, because the mean of its divisors is an integer number (215805920).

Almost surely, 2^1290275391 is an apocalyptic number.

1290275391 is a deficient number, since it is larger than the sum of its proper divisors (436171969).

1290275391 is a wasteful number, since it uses less digits than its factorization.

1290275391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520045.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 1290275391 is about 35920.4035472877. The cubic root of 1290275391 is about 1088.6646923150.

The spelling of 1290275391 in words is "one billion, two hundred ninety million, two hundred seventy-five thousand, three hundred ninety-one".