129820004 has 24 divisors (see below), whose sum is σ = 240612288. Its totient is φ = 61158240.

The previous prime is 129819959. The next prime is 129820043. The reversal of 129820004 is 400028921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4367 + ... + 16694.

It is an arithmetic number, because the mean of its divisors is an integer number (10025512).

Almost surely, 2^129820004 is an apocalyptic number.

It is an amenable number.

129820004 is a deficient number, since it is larger than the sum of its proper divisors (110792284).

129820004 is a wasteful number, since it uses less digits than its factorization.

129820004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21155 (or 21153 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 129820004 is about 11393.8581700844. The cubic root of 129820004 is about 506.3457931008.

Adding to 129820004 its reverse (400028921), we get a palindrome (529848925).

The spelling of 129820004 in words is "one hundred twenty-nine million, eight hundred twenty thousand, four".