385805440 has 32 divisors (see below), whose sum is σ = 922317660. Its totient is φ = 154321920.

The previous prime is 385805423. The next prime is 385805461. The reversal of 385805440 is 44508583.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 383219776 + 2585664 = 19576^2 + 1608^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 385805440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300771 + ... + 302050.

Almost surely, 2^385805440 is an apocalyptic number.

It is an amenable number.

385805440 is an abundant number, since it is smaller than the sum of its proper divisors (536512220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

385805440 is an equidigital number, since it uses as much as digits as its factorization.

385805440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602840 (or 602828 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The square root of 385805440 is about 19641.9306586700. The cubic root of 385805440 is about 727.9855892168.

The spelling of 385805440 in words is "three hundred eighty-five million, eight hundred five thousand, four hundred forty".