129621340 has 48 divisors (see below), whose sum is σ = 278669664. Its totient is φ = 50630400.

The previous prime is 129621337. The next prime is 129621341. The reversal of 129621340 is 43126921.

It is a junction number, because it is equal to n+sod(n) for n = 129621299 and 129621308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129621341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220527 + ... + 221113.

It is an arithmetic number, because the mean of its divisors is an integer number (5805618).

Almost surely, 2^129621340 is an apocalyptic number.

129621340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129621340 is an abundant number, since it is smaller than the sum of its proper divisors (149048324).

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

129621340 is a wasteful number, since it uses less digits than its factorization.

129621340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 129621340 is about 11385.1368019888. The cubic root of 129621340 is about 506.0873736645.

The spelling of 129621340 in words is "one hundred twenty-nine million, six hundred twenty-one thousand, three hundred forty".