381917489 has 4 divisors (see below), whose sum is σ = 394237440. Its totient is φ = 369597540.

The previous prime is 381917453. The next prime is 381917491. The reversal of 381917489 is 984719183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 984719183 = 7 ⋅140674169.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381917489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381910489) 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, 6159929 + ... + 6159990.

It is an arithmetic number, because the mean of its divisors is an integer number (98559360).

Almost surely, 2^381917489 is an apocalyptic number.

It is an amenable number.

381917489 is a deficient number, since it is larger than the sum of its proper divisors (12319951).

381917489 is a wasteful number, since it uses less digits than its factorization.

381917489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12319950.

The product of its digits is 435456, while the sum is 50.

The square root of 381917489 is about 19542.7093566885. The cubic root of 381917489 is about 725.5319055036.

The spelling of 381917489 in words is "three hundred eighty-one million, nine hundred seventeen thousand, four hundred eighty-nine".