129406274 has 4 divisors (see below), whose sum is σ = 194109414. Its totient is φ = 64703136.

The previous prime is 129406271. The next prime is 129406289. The reversal of 129406274 is 472604921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 472604921 = 1049 ⋅450529.

It can be written as a sum of positive squares in only one way, i.e., 129163225 + 243049 = 11365^2 + 493^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129406271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32351567 + ... + 32351570.

Almost surely, 2^129406274 is an apocalyptic number.

129406274 is a deficient number, since it is larger than the sum of its proper divisors (64703140).

129406274 is an equidigital number, since it uses as much as digits as its factorization.

129406274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64703139.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 129406274 is about 11375.6878473348. The cubic root of 129406274 is about 505.8073209120.

The spelling of 129406274 in words is "one hundred twenty-nine million, four hundred six thousand, two hundred seventy-four".