128203431 has 8 divisors (see below), whose sum is σ = 179934720. Its totient is φ = 80970552.

The previous prime is 128203429. The next prime is 128203459. The reversal of 128203431 is 134302821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128203431 - 2¹ = 128203429 is a prime.

It is a super-2 number, since 2×128203431² = 32872239440343522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128203331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1124535 + ... + 1124648.

It is an arithmetic number, because the mean of its divisors is an integer number (22491840).

Almost surely, 2^128203431 is an apocalyptic number.

128203431 is a deficient number, since it is larger than the sum of its proper divisors (51731289).

128203431 is a wasteful number, since it uses less digits than its factorization.

128203431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249205.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 128203431 is about 11322.6953946487. The cubic root of 128203431 is about 504.2352650992.

The spelling of 128203431 in words is "one hundred twenty-eight million, two hundred three thousand, four hundred thirty-one".