1213740378 has 48 divisors (see below), whose sum is σ = 2709837000. Its totient is φ = 392335488.

The previous prime is 1213740377. The next prime is 1213740391. The reversal of 1213740378 is 8730473121.

1213740378 is a `hidden beast` number, since 1 + 213 + 74 + 0 + 378 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 630662769 + 583077609 = 25113^2 + 24147^2 .

It is not an unprimeable number, because it can be changed into a prime (1213740377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208248 + ... + 213996.

Almost surely, 2^1213740378 is an apocalyptic number.

1213740378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213740378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1354918500).

1213740378 is an abundant number, since it is smaller than the sum of its proper divisors (1496096622).

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

1213740378 is a wasteful number, since it uses less digits than its factorization.

1213740378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6111 (or 6108 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 1213740378 is about 34838.7769303114. The cubic root of 1213740378 is about 1066.6991114914.

The spelling of 1213740378 in words is "one billion, two hundred thirteen million, seven hundred forty thousand, three hundred seventy-eight".