1378520443 has 2 divisors, whose sum is σ = 1378520444. Its totient is φ = 1378520442.

The previous prime is 1378520413. The next prime is 1378520453. The reversal of 1378520443 is 3440258731.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1378520443 - 2⁵ = 1378520411 is a prime.

It is a super-4 number, since 4×1378520443⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1378520413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689260221 + 689260222.

It is an arithmetic number, because the mean of its divisors is an integer number (689260222).

Almost surely, 2^1378520443 is an apocalyptic number.

1378520443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378520443 is an equidigital number, since it uses as much as digits as its factorization.

1378520443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 1378520443 is about 37128.4317336458. The cubic root of 1378520443 is about 1112.9382540974.

The spelling of 1378520443 in words is "one billion, three hundred seventy-eight million, five hundred twenty thousand, four hundred forty-three".