1381185078 has 32 divisors (see below), whose sum is σ = 3399841536. Its totient is φ = 364268448.

The previous prime is 1381185061. The next prime is 1381185079. The reversal of 1381185078 is 8705811831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381185079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1264276 + ... + 1265367.

It is an arithmetic number, because the mean of its divisors is an integer number (106245048).

Almost surely, 2^1381185078 is an apocalyptic number.

1381185078 is an abundant number, since it is smaller than the sum of its proper divisors (2018656458).

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

1381185078 is a wasteful number, since it uses less digits than its factorization.

1381185078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529668.

The product of its (nonzero) digits is 53760, while the sum is 42.

The square root of 1381185078 is about 37164.2984327701. The cubic root of 1381185078 is about 1113.6548836556.

It can be divided in two parts, 13811 and 85078, that added together give a palindrome (98889).

The spelling of 1381185078 in words is "one billion, three hundred eighty-one million, one hundred eighty-five thousand, seventy-eight".