1213399958 has 8 divisors (see below), whose sum is σ = 1833385752. Its totient is φ = 602271376.

The previous prime is 1213399921. The next prime is 1213399969. The reversal of 1213399958 is 8599933121.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2213960 + ... + 2214507.

It is an arithmetic number, because the mean of its divisors is an integer number (229173219).

Almost surely, 2^1213399958 is an apocalyptic number.

1213399958 is a deficient number, since it is larger than the sum of its proper divisors (619985794).

1213399958 is a wasteful number, since it uses less digits than its factorization.

1213399958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428606.

The product of its digits is 524880, while the sum is 50.

The square root of 1213399958 is about 34833.8909397156. The cubic root of 1213399958 is about 1066.5993758115.

The spelling of 1213399958 in words is "one billion, two hundred thirteen million, three hundred ninety-nine thousand, nine hundred fifty-eight".