1298979398 has 4 divisors (see below), whose sum is σ = 1948469100. Its totient is φ = 649489698.

The previous prime is 1298979377. The next prime is 1298979419. The reversal of 1298979398 is 8939798921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8939798921 = 10837 ⋅824933.

It is an interprime number because it is at equal distance from previous prime (1298979377) and next prime (1298979419).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324744848 + ... + 324744851.

It is an arithmetic number, because the mean of its divisors is an integer number (487117275).

Almost surely, 2^1298979398 is an apocalyptic number.

1298979398 is a deficient number, since it is larger than the sum of its proper divisors (649489702).

1298979398 is an equidigital number, since it uses as much as digits as its factorization.

1298979398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649489701.

The product of its digits is 17635968, while the sum is 65.

The square root of 1298979398 is about 36041.3567724635. The cubic root of 1298979398 is about 1091.1071986046.

The spelling of 1298979398 in words is "one billion, two hundred ninety-eight million, nine hundred seventy-nine thousand, three hundred ninety-eight".