1297296540 has 48 divisors (see below), whose sum is σ = 4036035360. Its totient is φ = 345945600.

The previous prime is 1297296523. The next prime is 1297296547. The reversal of 1297296540 is 456927921.

1297296540 is a `hidden beast` number, since 12 + 9 + 7 + 2 + 96 + 540 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297296547) 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, 1200661 + ... + 1201740.

It is an arithmetic number, because the mean of its divisors is an integer number (84084070).

Almost surely, 2^1297296540 is an apocalyptic number.

1297296540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1297296540 is an abundant number, since it is smaller than the sum of its proper divisors (2738738820).

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

1297296540 is a wasteful number, since it uses less digits than its factorization.

1297296540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402419 (or 2402411 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 1297296540 is about 36018.0029985006. The cubic root of 1297296540 is about 1090.6358100696.

The spelling of 1297296540 in words is "one billion, two hundred ninety-seven million, two hundred ninety-six thousand, five hundred forty".