1298297990 has 32 divisors (see below), whose sum is σ = 2699352864. Its totient is φ = 444336640.

The previous prime is 1298297989. The next prime is 1298297999. The reversal of 1298297990 is 997928921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298297999) 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, 345269 + ... + 349008.

It is an arithmetic number, because the mean of its divisors is an integer number (84354777).

Almost surely, 2^1298297990 is an apocalyptic number.

1298297990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1298297990 is an abundant number, since it is smaller than the sum of its proper divisors (1401054874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1298297990 is a wasteful number, since it uses less digits than its factorization.

1298297990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694312.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 1298297990 is about 36031.9023921857. The cubic root of 1298297990 is about 1090.9163772009.

The spelling of 1298297990 in words is "one billion, two hundred ninety-eight million, two hundred ninety-seven thousand, nine hundred ninety".