381688445 has 4 divisors (see below), whose sum is σ = 458026140. Its totient is φ = 305350752.

The previous prime is 381688423. The next prime is 381688451. The reversal of 381688445 is 544886183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146434201 + 235254244 = 12101^2 + 15338^2 .

It is a cyclic number.

It is not a de Polignac number, because 381688445 - 2¹⁰ = 381687421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381688445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38168840 + ... + 38168849.

It is an arithmetic number, because the mean of its divisors is an integer number (114506535).

Almost surely, 2^381688445 is an apocalyptic number.

It is an amenable number.

381688445 is a deficient number, since it is larger than the sum of its proper divisors (76337695).

381688445 is an equidigital number, since it uses as much as digits as its factorization.

381688445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76337694.

The product of its digits is 737280, while the sum is 47.

The square root of 381688445 is about 19536.8483896457. The cubic root of 381688445 is about 725.3868375540.

The spelling of 381688445 in words is "three hundred eighty-one million, six hundred eighty-eight thousand, four hundred forty-five".