1378838423 has 2 divisors, whose sum is σ = 1378838424. Its totient is φ = 1378838422.

The previous prime is 1378838399. The next prime is 1378838471. The reversal of 1378838423 is 3248388731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1378838423 - 2¹⁰ = 1378837399 is a prime.

It is a super-2 number, since 2×1378838423² = 3802390793482253858, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378832423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689419211 + 689419212.

It is an arithmetic number, because the mean of its divisors is an integer number (689419212).

Almost surely, 2^1378838423 is an apocalyptic number.

1378838423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378838423 is an equidigital number, since it uses as much as digits as its factorization.

1378838423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 47.

The square root of 1378838423 is about 37132.7136498263. The cubic root of 1378838423 is about 1113.0238204501.

The spelling of 1378838423 in words is "one billion, three hundred seventy-eight million, eight hundred thirty-eight thousand, four hundred twenty-three".