381980749 has 4 divisors (see below), whose sum is σ = 387213436. Its totient is φ = 376748064.

The previous prime is 381980747. The next prime is 381980777. The reversal of 381980749 is 947089183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947089183 = 997 ⋅949939.

It can be written as a sum of positive squares in 2 ways, for example, as 65496649 + 316484100 = 8093^2 + 17790^2 .

It is a cyclic number.

It is not a de Polignac number, because 381980749 - 2¹ = 381980747 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 (381980743) 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, 2616234 + ... + 2616379.

It is an arithmetic number, because the mean of its divisors is an integer number (96803359).

Almost surely, 2^381980749 is an apocalyptic number.

It is an amenable number.

381980749 is a deficient number, since it is larger than the sum of its proper divisors (5232687).

381980749 is an equidigital number, since it uses as much as digits as its factorization.

381980749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5232686.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 381980749 is about 19544.3277960640. The cubic root of 381980749 is about 725.5719618123.

The spelling of 381980749 in words is "three hundred eighty-one million, nine hundred eighty thousand, seven hundred forty-nine".