1377378213 has 4 divisors (see below), whose sum is σ = 1836504288. Its totient is φ = 918252140.

The previous prime is 1377378209. The next prime is 1377378221. The reversal of 1377378213 is 3128737731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1377378213 - 2² = 1377378209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377378283) 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, 229563033 + ... + 229563038.

It is an arithmetic number, because the mean of its divisors is an integer number (459126072).

Almost surely, 2^1377378213 is an apocalyptic number.

It is an amenable number.

1377378213 is a deficient number, since it is larger than the sum of its proper divisors (459126075).

1377378213 is an equidigital number, since it uses as much as digits as its factorization.

1377378213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459126074.

The product of its digits is 148176, while the sum is 42.

The square root of 1377378213 is about 37113.0463988070. The cubic root of 1377378213 is about 1112.6307788521.

The spelling of 1377378213 in words is "one billion, three hundred seventy-seven million, three hundred seventy-eight thousand, two hundred thirteen".