1297655520 has 192 divisors, whose sum is σ = 4709892096. Its totient is φ = 294174720.

The previous prime is 1297655503. The next prime is 1297655539. The reversal of 1297655520 is 255567921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425200 + ... + 428240.

It is an arithmetic number, because the mean of its divisors is an integer number (24530688).

Almost surely, 2^1297655520 is an apocalyptic number.

1297655520 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 1297655520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2354946048).

1297655520 is an abundant number, since it is smaller than the sum of its proper divisors (3412236576).

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

1297655520 is a wasteful number, since it uses less digits than its factorization.

1297655520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193 (or 3185 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 42.

The square root of 1297655520 is about 36022.9859950560. The cubic root of 1297655520 is about 1090.7363988257.

The spelling of 1297655520 in words is "one billion, two hundred ninety-seven million, six hundred fifty-five thousand, five hundred twenty".