381401749 has 4 divisors (see below), whose sum is σ = 403837164. Its totient is φ = 358966336.

The previous prime is 381401747. The next prime is 381401753. The reversal of 381401749 is 947104183.

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 209004849 + 172396900 = 14457^2 + 13130^2 .

It is a cyclic number.

It is not a de Polignac number, because 381401749 - 2¹ = 381401747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381401743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11217682 + ... + 11217715.

It is an arithmetic number, because the mean of its divisors is an integer number (100959291).

Almost surely, 2^381401749 is an apocalyptic number.

It is an amenable number.

381401749 is a deficient number, since it is larger than the sum of its proper divisors (22435415).

381401749 is a wasteful number, since it uses less digits than its factorization.

381401749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22435414.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 381401749 is about 19529.5096968664. The cubic root of 381401749 is about 725.2051731637.

The spelling of 381401749 in words is "three hundred eighty-one million, four hundred one thousand, seven hundred forty-nine".