1298399491 has 8 divisors (see below), whose sum is σ = 1332080640. Its totient is φ = 1264876872.

The previous prime is 1298399471. The next prime is 1298399503. The reversal of 1298399491 is 1949938921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1298399491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1298399441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22951 + ... + 55888.

It is an arithmetic number, because the mean of its divisors is an integer number (166510080).

Almost surely, 2^1298399491 is an apocalyptic number.

1298399491 is a deficient number, since it is larger than the sum of its proper divisors (33681149).

1298399491 is an equidigital number, since it uses as much as digits as its factorization.

1298399491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79265.

The product of its digits is 1259712, while the sum is 55.

The square root of 1298399491 is about 36033.3108525986. The cubic root of 1298399491 is about 1090.9448057586.

The spelling of 1298399491 in words is "one billion, two hundred ninety-eight million, three hundred ninety-nine thousand, four hundred ninety-one".