129956190 has 128 divisors (see below), whose sum is σ = 387459072. Its totient is φ = 27164160.

The previous prime is 129956137. The next prime is 129956207. The reversal of 129956190 is 91659921.

It is a happy number.

It is a super-2 number, since 2×129956190² = 33777222638632200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 493999 + ... + 494261.

It is an arithmetic number, because the mean of its divisors is an integer number (3027024).

Almost surely, 2^129956190 is an apocalyptic number.

129956190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129956190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193729536).

129956190 is an abundant number, since it is smaller than the sum of its proper divisors (257502882).

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

129956190 is a wasteful number, since it uses less digits than its factorization.

129956190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474.

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 129956190 is about 11399.8328935121. The cubic root of 129956190 is about 506.5227897300.

The spelling of 129956190 in words is "one hundred twenty-nine million, nine hundred fifty-six thousand, one hundred ninety".