129369240 has 384 divisors, whose sum is σ = 566092800. Its totient is φ = 24744960.

The previous prime is 129369223. The next prime is 129369257. The reversal of 129369240 is 42963921.

It is an interprime number because it is at equal distance from previous prime (129369223) and next prime (129369257).

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

It is a junction number, because it is equal to n+sod(n) for n = 129369195 and 129369204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 360181 + ... + 360539.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^129369240 is an apocalyptic number.

129369240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129369240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283046400).

129369240 is an abundant number, since it is smaller than the sum of its proper divisors (436723560).

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

129369240 is a wasteful number, since it uses less digits than its factorization.

129369240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 129369240 is about 11374.0599611572. The cubic root of 129369240 is about 505.7590649942.

The spelling of 129369240 in words is "one hundred twenty-nine million, three hundred sixty-nine thousand, two hundred forty".