1213238879 has 4 divisors (see below), whose sum is σ = 1213409160. Its totient is φ = 1213068600.

The previous prime is 1213238797. The next prime is 1213238893. The reversal of 1213238879 is 9788323121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213238879 - 2¹⁶ = 1213173343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213238899) 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, 73964 + ... + 88865.

It is an arithmetic number, because the mean of its divisors is an integer number (303352290).

Almost surely, 2^1213238879 is an apocalyptic number.

1213238879 is a deficient number, since it is larger than the sum of its proper divisors (170281).

1213238879 is an equidigital number, since it uses as much as digits as its factorization.

1213238879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170280.

The product of its digits is 145152, while the sum is 44.

The square root of 1213238879 is about 34831.5787612333. The cubic root of 1213238879 is about 1066.5521766549.

The spelling of 1213238879 in words is "one billion, two hundred thirteen million, two hundred thirty-eight thousand, eight hundred seventy-nine".