381621604 has 108 divisors (see below), whose sum is σ = 864813348. Its totient is φ = 146764800.

The previous prime is 381621601. The next prime is 381621607. The reversal of 381621604 is 406126183.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (381621601) and next prime (381621607).

It can be written as a sum of positive squares in 6 ways, for example, as 115605504 + 266016100 = 10752^2 + 16310^2 .

It is not an unprimeable number, because it can be changed into a prime (381621601) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1357944 + ... + 1358224.

It is an arithmetic number, because the mean of its divisors is an integer number (8007531).

Almost surely, 2^381621604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381621604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (432406674).

381621604 is an abundant number, since it is smaller than the sum of its proper divisors (483191744).

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

381621604 is a wasteful number, since it uses less digits than its factorization.

381621604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 381621604 is about 19535.1376754811. The cubic root of 381621604 is about 725.3444920121.

Adding to 381621604 its reverse (406126183), we get a palindrome (787747787).

The spelling of 381621604 in words is "three hundred eighty-one million, six hundred twenty-one thousand, six hundred four".