1297388019 has 4 divisors (see below), whose sum is σ = 1729850696. Its totient is φ = 864925344.

The previous prime is 1297388009. The next prime is 1297388021. The reversal of 1297388019 is 9108837921.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1297388019 - 2¹⁶ = 1297322483 is a prime.

It is a super-2 number, since 2×1297388019² = 3366431343689488722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1297388009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216231334 + ... + 216231339.

It is an arithmetic number, because the mean of its divisors is an integer number (432462674).

Almost surely, 2^1297388019 is an apocalyptic number.

1297388019 is a deficient number, since it is larger than the sum of its proper divisors (432462677).

1297388019 is an equidigital number, since it uses as much as digits as its factorization.

1297388019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432462676.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1297388019 is about 36019.2728827221. The cubic root of 1297388019 is about 1090.6614448994.

The spelling of 1297388019 in words is "one billion, two hundred ninety-seven million, three hundred eighty-eight thousand, nineteen".