1297323990 has 96 divisors (see below), whose sum is σ = 3673144800. Its totient is φ = 316431360.

The previous prime is 1297323949. The next prime is 1297324003. The reversal of 1297323990 is 993237921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36510 + ... + 62670.

It is an arithmetic number, because the mean of its divisors is an integer number (38261925).

Almost surely, 2^1297323990 is an apocalyptic number.

1297323990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1297323990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1836572400).

1297323990 is an abundant number, since it is smaller than the sum of its proper divisors (2375820810).

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

1297323990 is a wasteful number, since it uses less digits than its factorization.

1297323990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26222 (or 26219 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 1297323990 is about 36018.3840559234. The cubic root of 1297323990 is about 1090.6435024105.

It can be divided in two parts, 12973 and 23990, that added together give a palindrome (36963).

The spelling of 1297323990 in words is "one billion, two hundred ninety-seven million, three hundred twenty-three thousand, nine hundred ninety".