384480781 has 4 divisors (see below), whose sum is σ = 384538464. Its totient is φ = 384423100.

The previous prime is 384480737. The next prime is 384480787. The reversal of 384480781 is 187084483.

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: 187084483 = 1747 ⋅107089.

It is a cyclic number.

It is not a de Polignac number, because 384480781 - 2¹⁷ = 384349709 is a prime.

It is a super-2 number, since 2×384480781² = 295650941916739922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384480787) 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, 17305 + ... + 32686.

It is an arithmetic number, because the mean of its divisors is an integer number (96134616).

Almost surely, 2^384480781 is an apocalyptic number.

It is an amenable number.

384480781 is a deficient number, since it is larger than the sum of its proper divisors (57683).

384480781 is an equidigital number, since it uses as much as digits as its factorization.

384480781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57682.

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 384480781 is about 19608.1814812083. The cubic root of 384480781 is about 727.1514568208.

The spelling of 384480781 in words is "three hundred eighty-four million, four hundred eighty thousand, seven hundred eighty-one".