129951822 has 144 divisors (see below), whose sum is σ = 359157456. Its totient is φ = 31046400.

The previous prime is 129951781. The next prime is 129951823. The reversal of 129951822 is 228159921.

It is a super-2 number, since 2×129951822² = 33774952082239368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129951823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 462322 + ... + 462602.

It is an arithmetic number, because the mean of its divisors is an integer number (2494149).

Almost surely, 2^129951822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129951822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179578728).

129951822 is an abundant number, since it is smaller than the sum of its proper divisors (229205634).

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

129951822 is a wasteful number, since it uses less digits than its factorization.

129951822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 317 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 129951822 is about 11399.6413101466. The cubic root of 129951822 is about 506.5171146987.

The spelling of 129951822 in words is "one hundred twenty-nine million, nine hundred fifty-one thousand, eight hundred twenty-two".