388891090 has 32 divisors (see below), whose sum is σ = 821631744. Its totient is φ = 129729600.

The previous prime is 388891067. The next prime is 388891121. The reversal of 388891090 is 90198883.

It is a self number, because there is not a number n which added to its sum of digits gives 388891090.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72486 + ... + 77665.

It is an arithmetic number, because the mean of its divisors is an integer number (25675992).

Almost surely, 2^388891090 is an apocalyptic number.

388891090 is an abundant number, since it is smaller than the sum of its proper divisors (432740654).

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

388891090 is a wasteful number, since it uses less digits than its factorization.

388891090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150202.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 388891090 is about 19720.3217519390. The cubic root of 388891090 is about 729.9212337608.

The spelling of 388891090 in words is "three hundred eighty-eight million, eight hundred ninety-one thousand, ninety".