129475438 has 4 divisors (see below), whose sum is σ = 194213160. Its totient is φ = 64737718.

The previous prime is 129475433. The next prime is 129475439. The reversal of 129475438 is 834574921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834574921 = 269 ⋅3102509.

It is a junction number, because it is equal to n+sod(n) for n = 129475394 and 129475403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129475433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32368858 + ... + 32368861.

It is an arithmetic number, because the mean of its divisors is an integer number (48553290).

Almost surely, 2^129475438 is an apocalyptic number.

129475438 is a deficient number, since it is larger than the sum of its proper divisors (64737722).

129475438 is an equidigital number, since it uses as much as digits as its factorization.

129475438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64737721.

The product of its digits is 241920, while the sum is 43.

The square root of 129475438 is about 11378.7274332414. The cubic root of 129475438 is about 505.8974181067.

The spelling of 129475438 in words is "one hundred twenty-nine million, four hundred seventy-five thousand, four hundred thirty-eight".