128743437 has 4 divisors (see below), whose sum is σ = 171657920. Its totient is φ = 85828956.

The previous prime is 128743429. The next prime is 128743453. The reversal of 128743437 is 734347821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 734347821 = 3 ⋅244782607.

It is not a de Polignac number, because 128743437 - 2³ = 128743429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128743395 and 128743404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128743427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21457237 + ... + 21457242.

It is an arithmetic number, because the mean of its divisors is an integer number (42914480).

Almost surely, 2^128743437 is an apocalyptic number.

It is an amenable number.

128743437 is a deficient number, since it is larger than the sum of its proper divisors (42914483).

128743437 is an equidigital number, since it uses as much as digits as its factorization.

128743437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42914482.

The product of its digits is 112896, while the sum is 39.

The square root of 128743437 is about 11346.5165138909. The cubic root of 128743437 is about 504.9422369641.

The spelling of 128743437 in words is "one hundred twenty-eight million, seven hundred forty-three thousand, four hundred thirty-seven".