385878691 has 8 divisors (see below), whose sum is σ = 422013168. Its totient is φ = 349920000.

The previous prime is 385878677. The next prime is 385878697. The reversal of 385878691 is 196878583.

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

It is a 8-Lehmer number, since φ(385878691) divides (385878691-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 385878691 - 2²¹ = 383781539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385878697) 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, 39330 + ... + 48151.

It is an arithmetic number, because the mean of its divisors is an integer number (52751646).

Almost surely, 2^385878691 is an apocalyptic number.

385878691 is a deficient number, since it is larger than the sum of its proper divisors (36134477).

385878691 is a wasteful number, since it uses less digits than its factorization.

385878691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87893.

The product of its digits is 2903040, while the sum is 55.

The square root of 385878691 is about 19643.7952290284. The cubic root of 385878691 is about 728.0316593274.

It can be divided in two parts, 38587 and 8691, that added together give a triangular number (47278 = T₃₀₇).

The spelling of 385878691 in words is "three hundred eighty-five million, eight hundred seventy-eight thousand, six hundred ninety-one".