1381975878 has 16 divisors (see below), whose sum is σ = 2792447280. Its totient is φ = 455909376.

The previous prime is 1381975873. The next prime is 1381975919. The reversal of 1381975878 is 8785791831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381975871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1186683 + ... + 1187846.

It is an arithmetic number, because the mean of its divisors is an integer number (174527955).

Almost surely, 2^1381975878 is an apocalyptic number.

1381975878 is an abundant number, since it is smaller than the sum of its proper divisors (1410471402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381975878 is a wasteful number, since it uses less digits than its factorization.

1381975878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374631.

The product of its digits is 3386880, while the sum is 57.

The square root of 1381975878 is about 37174.9361532740. The cubic root of 1381975878 is about 1113.8673848068.

The spelling of 1381975878 in words is "one billion, three hundred eighty-one million, nine hundred seventy-five thousand, eight hundred seventy-eight".