385191990 has 64 divisors (see below), whose sum is σ = 1031037120. Its totient is φ = 102332160.

The previous prime is 385191977. The next prime is 385191991. The reversal of 385191990 is 99191583.

385191990 is a `hidden beast` number, since 38 + 519 + 19 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385191991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73332 + ... + 78408.

It is an arithmetic number, because the mean of its divisors is an integer number (16109955).

Almost surely, 2^385191990 is an apocalyptic number.

385191990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 385191990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (515518560).

385191990 is an abundant number, since it is smaller than the sum of its proper divisors (645845130).

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

385191990 is a wasteful number, since it uses less digits than its factorization.

385191990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5374 (or 5368 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 385191990 is about 19626.3086187902. The cubic root of 385191990 is about 727.5995399987.

The spelling of 385191990 in words is "three hundred eighty-five million, one hundred ninety-one thousand, nine hundred ninety".