1279138898 has 8 divisors (see below), whose sum is σ = 1926004608. Its totient is φ = 637137364.

The previous prime is 1279138891. The next prime is 1279138901. The reversal of 1279138898 is 8988319721.

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

It is not an unprimeable number, because it can be changed into a prime (1279138891) 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, 1215386 + ... + 1216437.

It is an arithmetic number, because the mean of its divisors is an integer number (240750576).

Almost surely, 2^1279138898 is an apocalyptic number.

1279138898 is a deficient number, since it is larger than the sum of its proper divisors (646865710).

1279138898 is a wasteful number, since it uses less digits than its factorization.

1279138898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432088.

The product of its digits is 1741824, while the sum is 56.

The square root of 1279138898 is about 35765.0513490474. The cubic root of 1279138898 is about 1085.5235138480.

The spelling of 1279138898 in words is "one billion, two hundred seventy-nine million, one hundred thirty-eight thousand, eight hundred ninety-eight".