129905654 has 4 divisors (see below), whose sum is σ = 194858484. Its totient is φ = 64952826.

The previous prime is 129905639. The next prime is 129905683. The reversal of 129905654 is 456509921.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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, 32476412 + ... + 32476415.

It is an arithmetic number, because the mean of its divisors is an integer number (48714621).

Almost surely, 2^129905654 is an apocalyptic number.

129905654 is a deficient number, since it is larger than the sum of its proper divisors (64952830).

129905654 is an equidigital number, since it uses as much as digits as its factorization.

129905654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64952829.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 129905654 is about 11397.6161542666. The cubic root of 129905654 is about 506.4571241277.

The spelling of 129905654 in words is "one hundred twenty-nine million, nine hundred five thousand, six hundred fifty-four".