1297940819 has 4 divisors (see below), whose sum is σ = 1483360944. Its totient is φ = 1112520696.

The previous prime is 1297940783. The next prime is 1297940843. The reversal of 1297940819 is 9180497921.

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

It is not a de Polignac number, because 1297940819 - 2¹⁶ = 1297875283 is a prime.

It is a super-2 number, since 2×1297940819² = 3369300739252781522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1297940869) 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, 92710052 + ... + 92710065.

It is an arithmetic number, because the mean of its divisors is an integer number (370840236).

Almost surely, 2^1297940819 is an apocalyptic number.

1297940819 is a deficient number, since it is larger than the sum of its proper divisors (185420125).

1297940819 is an equidigital number, since it uses as much as digits as its factorization.

1297940819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185420124.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 1297940819 is about 36026.9457351022. The cubic root of 1297940819 is about 1090.8163284106.

The spelling of 1297940819 in words is "one billion, two hundred ninety-seven million, nine hundred forty thousand, eight hundred nineteen".