129999492 has 180 divisors, whose sum is σ = 410462976. Its totient is φ = 35108640.

The previous prime is 129999491. The next prime is 129999503. The reversal of 129999492 is 294999921.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (129999491) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3023223 + ... + 3023265.

Almost surely, 2^129999492 is an apocalyptic number.

129999492 is a gapful number since it is divisible by the number (12) 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 129999492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205231488).

129999492 is an abundant number, since it is smaller than the sum of its proper divisors (280463484).

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

129999492 is a wasteful number, since it uses less digits than its factorization.

129999492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 86 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 129999492 is about 11401.7319736959. The cubic root of 129999492 is about 506.5790420567.

The spelling of 129999492 in words is "one hundred twenty-nine million, nine hundred ninety-nine thousand, four hundred ninety-two".