129193638 has 16 divisors (see below), whose sum is σ = 295299840. Its totient is φ = 36912456.

The previous prime is 129193633. The next prime is 129193639. The reversal of 129193638 is 836391921.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 3076039 = 129193638 / (1 + 2 + 9 + 1 + 9 + 3 + 6 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 129193638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129193633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1537978 + ... + 1538061.

It is an arithmetic number, because the mean of its divisors is an integer number (18456240).

Almost surely, 2^129193638 is an apocalyptic number.

129193638 is an abundant number, since it is smaller than the sum of its proper divisors (166106202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129193638 is a wasteful number, since it uses less digits than its factorization.

129193638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3076051.

The product of its digits is 69984, while the sum is 42.

The square root of 129193638 is about 11366.3379326853. The cubic root of 129193638 is about 505.5301272205.

The spelling of 129193638 in words is "one hundred twenty-nine million, one hundred ninety-three thousand, six hundred thirty-eight".