1213809357 has 32 divisors (see below), whose sum is σ = 1747077120. Its totient is φ = 747187200.

The previous prime is 1213809343. The next prime is 1213809427. The reversal of 1213809357 is 7539083121.

It is not a de Polignac number, because 1213809357 - 2⁸ = 1213809101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213809307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 757357 + ... + 758957.

It is an arithmetic number, because the mean of its divisors is an integer number (54596160).

Almost surely, 2^1213809357 is an apocalyptic number.

It is an amenable number.

1213809357 is a deficient number, since it is larger than the sum of its proper divisors (533267763).

1213809357 is a wasteful number, since it uses less digits than its factorization.

1213809357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 1213809357 is about 34839.7668907242. The cubic root of 1213809357 is about 1066.7193185707.

The spelling of 1213809357 in words is "one billion, two hundred thirteen million, eight hundred nine thousand, three hundred fifty-seven".