388889280 has 504 divisors, whose sum is σ = 1566257472. Its totient is φ = 88178688.

The previous prime is 388889273. The next prime is 388889311. The reversal of 388889280 is 82988883.

388889280 = T₂₄₁ + T₂₄₂ + ... + T₁₃₂₈.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8274217 + ... + 8274263.

Almost surely, 2^388889280 is an apocalyptic number.

388889280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388889280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783128736).

388889280 is an abundant number, since it is smaller than the sum of its proper divisors (1177368192).

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

388889280 is a wasteful number, since it uses less digits than its factorization.

388889280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 54.

The square root of 388889280 is about 19720.2758601395. The cubic root of 388889280 is about 729.9201013448.

The spelling of 388889280 in words is "three hundred eighty-eight million, eight hundred eighty-nine thousand, two hundred eighty".