381778936 has 32 divisors (see below), whose sum is σ = 892471680. Its totient is φ = 148744800.

The previous prime is 381778907. The next prime is 381778949. The reversal of 381778936 is 639877183.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309270 + ... + 310501.

It is an arithmetic number, because the mean of its divisors is an integer number (27889740).

Almost surely, 2^381778936 is an apocalyptic number.

It is an amenable number.

381778936 is an abundant number, since it is smaller than the sum of its proper divisors (510692744).

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

381778936 is a wasteful number, since it uses less digits than its factorization.

381778936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619795 (or 619791 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 52.

The square root of 381778936 is about 19539.1641581722. The cubic root of 381778936 is about 725.4441581204. Note that the first 3 decimals are identical.

The spelling of 381778936 in words is "three hundred eighty-one million, seven hundred seventy-eight thousand, nine hundred thirty-six".