1000385481 has 4 divisors (see below), whose sum is σ = 1333847312. Its totient is φ = 666923652.

The previous prime is 1000385443. The next prime is 1000385501. The reversal of 1000385481 is 1845830001.

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: 1845830001 = 3 ⋅615276667.

It is not a de Polignac number, because 1000385481 - 2¹⁰ = 1000384457 is a prime.

It is a super-2 number, since 2×1000385481² = 2001542221191202722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000385081) 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, 166730911 + ... + 166730916.

It is an arithmetic number, because the mean of its divisors is an integer number (333461828).

Almost surely, 2^1000385481 is an apocalyptic number.

It is an amenable number.

1000385481 is a deficient number, since it is larger than the sum of its proper divisors (333461831).

1000385481 is an equidigital number, since it uses as much as digits as its factorization.

1000385481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333461830.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1000385481 is about 31628.8710041949. The cubic root of 1000385481 is about 1000.1284771596.

The spelling of 1000385481 in words is "one billion, three hundred eighty-five thousand, four hundred eighty-one".