1378857550 has 108 divisors (see below), whose sum is σ = 3150702360. Its totient is φ = 447582240.

The previous prime is 1378857517. The next prime is 1378857551. The reversal of 1378857550 is 557588731.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 1378857494 and 1378857503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378857551) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 883671 + ... + 885229.

It is an arithmetic number, because the mean of its divisors is an integer number (29173170).

Almost surely, 2^1378857550 is an apocalyptic number.

1378857550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1378857550 is an abundant number, since it is smaller than the sum of its proper divisors (1771844810).

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

1378857550 is a wasteful number, since it uses less digits than its factorization.

1378857550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1592 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 49.

The square root of 1378857550 is about 37132.9711981145. The cubic root of 1378857550 is about 1113.0289669821.

The spelling of 1378857550 in words is "one billion, three hundred seventy-eight million, eight hundred fifty-seven thousand, five hundred fifty".