385680781 has 8 divisors (see below), whose sum is σ = 388499328. Its totient is φ = 382872000.

The previous prime is 385680769. The next prime is 385680793. The reversal of 385680781 is 187086583.

It is an interprime number because it is at equal distance from previous prime (385680769) and next prime (385680793).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 385680781 - 2⁷ = 385680653 is a prime.

It is a super-2 number, since 2×385680781² = 297499329665539922, 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 (385680181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88821 + ... + 93061.

It is an arithmetic number, because the mean of its divisors is an integer number (48562416).

Almost surely, 2^385680781 is an apocalyptic number.

It is an amenable number.

385680781 is a deficient number, since it is larger than the sum of its proper divisors (2818547).

385680781 is a wasteful number, since it uses less digits than its factorization.

385680781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4883.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 385680781 is about 19638.7571144408. The cubic root of 385680781 is about 727.9071734126.

The spelling of 385680781 in words is "three hundred eighty-five million, six hundred eighty thousand, seven hundred eighty-one".