1298939645 has 8 divisors (see below), whose sum is σ = 1561013856. Its totient is φ = 1037627536.

The previous prime is 1298939639. The next prime is 1298939669. The reversal of 1298939645 is 5469398921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1298939645 - 2¹⁴ = 1298923261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186767 + ... + 193596.

It is an arithmetic number, because the mean of its divisors is an integer number (195126732).

Almost surely, 2^1298939645 is an apocalyptic number.

It is an amenable number.

1298939645 is a deficient number, since it is larger than the sum of its proper divisors (262074211).

1298939645 is an equidigital number, since it uses as much as digits as its factorization.

1298939645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381051.

The product of its digits is 4199040, while the sum is 56.

The square root of 1298939645 is about 36040.8052767970. The cubic root of 1298939645 is about 1091.0960680132.

The spelling of 1298939645 in words is "one billion, two hundred ninety-eight million, nine hundred thirty-nine thousand, six hundred forty-five".