129449402 has 4 divisors (see below), whose sum is σ = 194174106. Its totient is φ = 64724700.

The previous prime is 129449357. The next prime is 129449429. The reversal of 129449402 is 204944921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204944921 = 283 ⋅724187.

It can be written as a sum of positive squares in only one way, i.e., 73633561 + 55815841 = 8581^2 + 7471^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32362349 + ... + 32362352.

Almost surely, 2^129449402 is an apocalyptic number.

129449402 is a deficient number, since it is larger than the sum of its proper divisors (64724704).

129449402 is an equidigital number, since it uses as much as digits as its factorization.

129449402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64724703.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 129449402 is about 11377.5833110551. The cubic root of 129449402 is about 505.8635058106.

The spelling of 129449402 in words is "one hundred twenty-nine million, four hundred forty-nine thousand, four hundred two".