1298270723 has 4 divisors (see below), whose sum is σ = 1299509400. Its totient is φ = 1297032048.

The previous prime is 1298270683. The next prime is 1298270737. The reversal of 1298270723 is 3270728921.

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

It is a cyclic number.

It is not a de Polignac number, because 1298270723 - 2²² = 1294076419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1298270123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617765 + ... + 619862.

It is an arithmetic number, because the mean of its divisors is an integer number (324877350).

Almost surely, 2^1298270723 is an apocalyptic number.

1298270723 is a deficient number, since it is larger than the sum of its proper divisors (1238677).

1298270723 is a wasteful number, since it uses less digits than its factorization.

1298270723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238676.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 1298270723 is about 36031.5240171714. The cubic root of 1298270723 is about 1090.9087399647.

The spelling of 1298270723 in words is "one billion, two hundred ninety-eight million, two hundred seventy thousand, seven hundred twenty-three".