1297785375 has 64 divisors (see below), whose sum is σ = 2407242240. Its totient is φ = 689911200.

The previous prime is 1297785353. The next prime is 1297785403. The reversal of 1297785375 is 5735877921.

It is a happy number.

1297785375 is a `hidden beast` number, since 12 + 97 + 7 + 8 + 537 + 5 = 666.

It is not a de Polignac number, because 1297785375 - 2⁵ = 1297785343 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1899784 + ... + 1900466.

It is an arithmetic number, because the mean of its divisors is an integer number (37613160).

Almost surely, 2^1297785375 is an apocalyptic number.

1297785375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1297785375 is a deficient number, since it is larger than the sum of its proper divisors (1109456865).

1297785375 is an equidigital number, since it uses as much as digits as its factorization.

1297785375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270 (or 1254 counting only the distinct ones).

The product of its digits is 3704400, while the sum is 54.

The square root of 1297785375 is about 36024.7883408078. The cubic root of 1297785375 is about 1090.7727805538.

The spelling of 1297785375 in words is "one billion, two hundred ninety-seven million, seven hundred eighty-five thousand, three hundred seventy-five".