1278342213 has 8 divisors (see below), whose sum is σ = 1726032000. Its totient is φ = 841440288.

The previous prime is 1278342113. The next prime is 1278342223. The reversal of 1278342213 is 3122438721.

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

It is not a de Polignac number, because 1278342213 - 2⁸ = 1278341957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278342223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2696688 + ... + 2697161.

It is an arithmetic number, because the mean of its divisors is an integer number (215754000).

Almost surely, 2^1278342213 is an apocalyptic number.

It is an amenable number.

1278342213 is a deficient number, since it is larger than the sum of its proper divisors (447689787).

1278342213 is an equidigital number, since it uses as much as digits as its factorization.

1278342213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393931.

The product of its digits is 16128, while the sum is 33.

The square root of 1278342213 is about 35753.9118559075. The cubic root of 1278342213 is about 1085.2981018126.

The spelling of 1278342213 in words is "one billion, two hundred seventy-eight million, three hundred forty-two thousand, two hundred thirteen".