1378892538 has 16 divisors (see below), whose sum is σ = 3064205760. Its totient is φ = 459630828.

The previous prime is 1378892513. The next prime is 1378892549. The reversal of 1378892538 is 8352988731.

1378892538 is a `hidden beast` number, since 13 + 7 + 8 + 8 + 92 + 538 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 25535047 = 1378892538 / (1 + 3 + 7 + 8 + 8 + 9 + 2 + 5 + 3 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12767470 + ... + 12767577.

It is an arithmetic number, because the mean of its divisors is an integer number (191512860).

Almost surely, 2^1378892538 is an apocalyptic number.

1378892538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1378892538 is an abundant number, since it is smaller than the sum of its proper divisors (1685313222).

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

1378892538 is a wasteful number, since it uses less digits than its factorization.

1378892538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25535058 (or 25535052 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 1378892538 is about 37133.4423128263. The cubic root of 1378892538 is about 1113.0383811351.

The spelling of 1378892538 in words is "one billion, three hundred seventy-eight million, eight hundred ninety-two thousand, five hundred thirty-eight".