381431550 has 96 divisors (see below), whose sum is σ = 1012194144. Its totient is φ = 94720000.

The previous prime is 381431539. The next prime is 381431581. The reversal of 381431550 is 55134183.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 256810 + ... + 258290.

It is an arithmetic number, because the mean of its divisors is an integer number (10543689).

Almost surely, 2^381431550 is an apocalyptic number.

381431550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 381431550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (506097072).

381431550 is an abundant number, since it is smaller than the sum of its proper divisors (630762594).

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

381431550 is a wasteful number, since it uses less digits than its factorization.

381431550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614 (or 1609 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 381431550 is about 19530.2726555468. The cubic root of 381431550 is about 725.2240607510.

It can be divided in two parts, 38143 and 1550, that added together give a palindrome (39693).

The spelling of 381431550 in words is "three hundred eighty-one million, four hundred thirty-one thousand, five hundred fifty".