381006890 has 64 divisors (see below), whose sum is σ = 804256128. Its totient is φ = 128409600.

The previous prime is 381006889. The next prime is 381006893. The reversal of 381006890 is 98600183.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 381006890.

It is not an unprimeable number, because it can be changed into a prime (381006893) 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, 123770 + ... + 126810.

It is an arithmetic number, because the mean of its divisors is an integer number (12566502).

Almost surely, 2^381006890 is an apocalyptic number.

381006890 is an abundant number, since it is smaller than the sum of its proper divisors (423249238).

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

381006890 is a wasteful number, since it uses less digits than its factorization.

381006890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 381006890 is about 19519.3977878417. The cubic root of 381006890 is about 724.9548223929.

The spelling of 381006890 in words is "three hundred eighty-one million, six thousand, eight hundred ninety".