1378540393 has 4 divisors (see below), whose sum is σ = 1378918980. Its totient is φ = 1378161808.

The previous prime is 1378540391. The next prime is 1378540451. The reversal of 1378540393 is 3930458731.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1242421504 + 136118889 = 35248^2 + 11667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378540393 - 2¹ = 1378540391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378540391) 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, 183778 + ... + 191131.

It is an arithmetic number, because the mean of its divisors is an integer number (344729745).

Almost surely, 2^1378540393 is an apocalyptic number.

It is an amenable number.

1378540393 is a deficient number, since it is larger than the sum of its proper divisors (378587).

1378540393 is an equidigital number, since it uses as much as digits as its factorization.

1378540393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378586.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 1378540393 is about 37128.7003947081. The cubic root of 1378540393 is about 1112.9436228997.

The spelling of 1378540393 in words is "one billion, three hundred seventy-eight million, five hundred forty thousand, three hundred ninety-three".