188420439 has 16 divisors (see below), whose sum is σ = 265849344. Its totient is φ = 118456800.

The previous prime is 188420437. The next prime is 188420443. The reversal of 188420439 is 934024881.

It is not a de Polignac number, because 188420439 - 2¹ = 188420437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188420397 and 188420406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188420431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14332 + ... + 24129.

It is an arithmetic number, because the mean of its divisors is an integer number (16615584).

Almost surely, 2^188420439 is an apocalyptic number.

188420439 is a deficient number, since it is larger than the sum of its proper divisors (77428905).

188420439 is a wasteful number, since it uses less digits than its factorization.

188420439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38558.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 188420439 is about 13726.6324712218. The cubic root of 188420439 is about 573.2921614642.

The spelling of 188420439 in words is "one hundred eighty-eight million, four hundred twenty thousand, four hundred thirty-nine".