1378879947 has 12 divisors (see below), whose sum is σ = 2000492520. Its totient is φ = 915202368.

The previous prime is 1378879939. The next prime is 1378879961. The reversal of 1378879947 is 7499788731.

It is not a de Polignac number, because 1378879947 - 2³ = 1378879939 is a prime.

It is a super-3 number, since 3×1378879947³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1378879927) 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, 335422 + ... + 339507.

It is an arithmetic number, because the mean of its divisors is an integer number (166707710).

Almost surely, 2^1378879947 is an apocalyptic number.

1378879947 is a deficient number, since it is larger than the sum of its proper divisors (621612573).

1378879947 is a wasteful number, since it uses less digits than its factorization.

1378879947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675162 (or 675159 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The square root of 1378879947 is about 37133.2727752349. The cubic root of 1378879947 is about 1113.0349933176.

The spelling of 1378879947 in words is "one billion, three hundred seventy-eight million, eight hundred seventy-nine thousand, nine hundred forty-seven".