381780126 has 72 divisors (see below), whose sum is σ = 1023731280. Its totient is φ = 100683648.

The previous prime is 381780103. The next prime is 381780143. The reversal of 381780126 is 621087183.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12330 + ... + 30258.

It is an arithmetic number, because the mean of its divisors is an integer number (14218490).

Almost surely, 2^381780126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381780126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (511865640).

381780126 is an abundant number, since it is smaller than the sum of its proper divisors (641951154).

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

381780126 is a wasteful number, since it uses less digits than its factorization.

381780126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17970 (or 17954 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 381780126 is about 19539.1946098093. The cubic root of 381780126 is about 725.4449118530. Note that the first 3 decimals are identical.

The spelling of 381780126 in words is "three hundred eighty-one million, seven hundred eighty thousand, one hundred twenty-six".