128942390 has 16 divisors (see below), whose sum is σ = 235366560. Its totient is φ = 50850240.

The previous prime is 128942353. The next prime is 128942419. The reversal of 128942390 is 93249821.

It is a super-2 number, since 2×128942390² = 33252279877824200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90095 + ... + 91514.

It is an arithmetic number, because the mean of its divisors is an integer number (14710410).

Almost surely, 2^128942390 is an apocalyptic number.

128942390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128942390 is a deficient number, since it is larger than the sum of its proper divisors (106424170).

128942390 is a wasteful number, since it uses less digits than its factorization.

128942390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181687.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 128942390 is about 11355.2802695486. The cubic root of 128942390 is about 505.2022063815.

The spelling of 128942390 in words is "one hundred twenty-eight million, nine hundred forty-two thousand, three hundred ninety".