128140349 has 4 divisors (see below), whose sum is σ = 128281920. Its totient is φ = 127998780.

The previous prime is 128140307. The next prime is 128140367. The reversal of 128140349 is 943041821.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 128140349 - 2⁸ = 128140093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128140399) 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, 69419 + ... + 71240.

It is an arithmetic number, because the mean of its divisors is an integer number (32070480).

Almost surely, 2^128140349 is an apocalyptic number.

It is an amenable number.

128140349 is a deficient number, since it is larger than the sum of its proper divisors (141571).

128140349 is an equidigital number, since it uses as much as digits as its factorization.

128140349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141570.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 128140349 is about 11319.9094077647. The cubic root of 128140349 is about 504.1525491968.

The spelling of 128140349 in words is "one hundred twenty-eight million, one hundred forty thousand, three hundred forty-nine".