1296988390 has 16 divisors (see below), whose sum is σ = 2335631760. Its totient is φ = 518561440.

The previous prime is 1296988339. The next prime is 1296988391. The reversal of 1296988390 is 938896921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296988391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4996 + ... + 51175.

It is an arithmetic number, because the mean of its divisors is an integer number (145976985).

Almost surely, 2^1296988390 is an apocalyptic number.

1296988390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1296988390 is a deficient number, since it is larger than the sum of its proper divisors (1038643370).

1296988390 is a wasteful number, since it uses less digits than its factorization.

1296988390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58487.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 1296988390 is about 36013.7250225522. The cubic root of 1296988390 is about 1090.5494494399.

The spelling of 1296988390 in words is "one billion, two hundred ninety-six million, nine hundred eighty-eight thousand, three hundred ninety".