1378144779 has 16 divisors (see below), whose sum is σ = 2006586624. Its totient is φ = 834400800.

The previous prime is 1378144777. The next prime is 1378144783. The reversal of 1378144779 is 9774418731.

It is not a de Polignac number, because 1378144779 - 2¹ = 1378144777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1378144771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13242 + ... + 54144.

It is an arithmetic number, because the mean of its divisors is an integer number (125411664).

Almost surely, 2^1378144779 is an apocalyptic number.

1378144779 is a deficient number, since it is larger than the sum of its proper divisors (628441845).

1378144779 is a wasteful number, since it uses less digits than its factorization.

1378144779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41938.

The product of its digits is 1185408, while the sum is 51.

The square root of 1378144779 is about 37123.3724087670. The cubic root of 1378144779 is about 1112.8371483981.

The spelling of 1378144779 in words is "one billion, three hundred seventy-eight million, one hundred forty-four thousand, seven hundred seventy-nine".