1297993620 has 144 divisors (see below), whose sum is σ = 4565683584. Its totient is φ = 269702400.

The previous prime is 1297993601. The next prime is 1297993649. The reversal of 1297993620 is 263997921.

It is a self number, because there is not a number n which added to its sum of digits gives 1297993620.

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, 38050 + ... + 63590.

It is an arithmetic number, because the mean of its divisors is an integer number (31706136).

Almost surely, 2^1297993620 is an apocalyptic number.

1297993620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1297993620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2282841792).

1297993620 is an abundant number, since it is smaller than the sum of its proper divisors (3267689964).

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

1297993620 is a wasteful number, since it uses less digits than its factorization.

1297993620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25582 (or 25569 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 1297993620 is about 36027.6785263775. The cubic root of 1297993620 is about 1090.8311198944.

The spelling of 1297993620 in words is "one billion, two hundred ninety-seven million, nine hundred ninety-three thousand, six hundred twenty".