129819420 has 36 divisors (see below), whose sum is σ = 393786120. Its totient is φ = 34618464.

The previous prime is 129819409. The next prime is 129819427. The reversal of 129819420 is 24918921.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129819427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 360430 + ... + 360789.

Almost surely, 2^129819420 is an apocalyptic number.

129819420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129819420 is an abundant number, since it is smaller than the sum of its proper divisors (263966700).

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

129819420 is a wasteful number, since it uses less digits than its factorization.

129819420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721234 (or 721229 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 129819420 is about 11393.8325422134. The cubic root of 129819420 is about 506.3450338280.

The spelling of 129819420 in words is "one hundred twenty-nine million, eight hundred nineteen thousand, four hundred twenty".