1378020385 has 12 divisors (see below), whose sum is σ = 1923604308. Its totient is φ = 944928096.

The previous prime is 1378020361. The next prime is 1378020409. The reversal of 1378020385 is 5830208731.

It is an interprime number because it is at equal distance from previous prime (1378020361) and next prime (1378020409).

It can be written as a sum of positive squares in 2 ways, for example, as 1002862224 + 375158161 = 31668^2 + 19369^2 .

It is not a de Polignac number, because 1378020385 - 2⁹ = 1378019873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2812042 + ... + 2812531.

It is an arithmetic number, because the mean of its divisors is an integer number (160300359).

Almost surely, 2^1378020385 is an apocalyptic number.

It is an amenable number.

1378020385 is a deficient number, since it is larger than the sum of its proper divisors (545583923).

1378020385 is an equidigital number, since it uses as much as digits as its factorization.

1378020385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624592 (or 5624585 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1378020385 is about 37121.6969574399. The cubic root of 1378020385 is about 1112.8036651164.

The spelling of 1378020385 in words is "one billion, three hundred seventy-eight million, twenty thousand, three hundred eighty-five".