1378443979 has 12 divisors (see below), whose sum is σ = 1567399680. Its totient is φ = 1209916400.

The previous prime is 1378443959. The next prime is 1378444003. The reversal of 1378443979 is 9793448731.

It is not a de Polignac number, because 1378443979 - 2⁷ = 1378443851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1378443959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192907 + ... + 199924.

It is an arithmetic number, because the mean of its divisors is an integer number (130616640).

Almost surely, 2^1378443979 is an apocalyptic number.

1378443979 is a deficient number, since it is larger than the sum of its proper divisors (188955701).

1378443979 is a wasteful number, since it uses less digits than its factorization.

1378443979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392882 (or 392871 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 55.

The square root of 1378443979 is about 37127.4019963692. The cubic root of 1378443979 is about 1112.9176761692.

The spelling of 1378443979 in words is "one billion, three hundred seventy-eight million, four hundred forty-three thousand, nine hundred seventy-nine".