1213279394 has 8 divisors (see below), whose sum is σ = 1899046080. Its totient is φ = 580264036.

The previous prime is 1213279391. The next prime is 1213279411. The reversal of 1213279394 is 4939723121.

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 (1213279391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13187774 + ... + 13187865.

It is an arithmetic number, because the mean of its divisors is an integer number (237380760).

Almost surely, 2^1213279394 is an apocalyptic number.

1213279394 is a deficient number, since it is larger than the sum of its proper divisors (685766686).

1213279394 is a wasteful number, since it uses less digits than its factorization.

1213279394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26375664.

The product of its digits is 81648, while the sum is 41.

The square root of 1213279394 is about 34832.1603406966. The cubic root of 1213279394 is about 1066.5640487001.

The spelling of 1213279394 in words is "one billion, two hundred thirteen million, two hundred seventy-nine thousand, three hundred ninety-four".