1298401739 has 4 divisors (see below), whose sum is σ = 1305655560. Its totient is φ = 1291147920.

The previous prime is 1298401721. The next prime is 1298401747. The reversal of 1298401739 is 9371048921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9371048921 = 13 ⋅720849917.

It is a cyclic number.

It is not a de Polignac number, because 1298401739 - 2²⁴ = 1281624523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1298401739.

It is not an unprimeable number, because it can be changed into a prime (1298401339) 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, 3626642 + ... + 3626999.

It is an arithmetic number, because the mean of its divisors is an integer number (326413890).

Almost surely, 2^1298401739 is an apocalyptic number.

1298401739 is a deficient number, since it is larger than the sum of its proper divisors (7253821).

1298401739 is an equidigital number, since it uses as much as digits as its factorization.

1298401739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7253820.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1298401739 is about 36033.3420459441. The cubic root of 1298401739 is about 1090.9454353651.

The spelling of 1298401739 in words is "one billion, two hundred ninety-eight million, four hundred one thousand, seven hundred thirty-nine".