129777390 has 80 divisors (see below), whose sum is σ = 355658688. Its totient is φ = 33943104.

The previous prime is 129777379. The next prime is 129777409. The reversal of 129777390 is 93777921.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 41419 + ... + 44441.

Almost surely, 2^129777390 is an apocalyptic number.

129777390 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 129777390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177829344).

129777390 is an abundant number, since it is smaller than the sum of its proper divisors (225881298).

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

129777390 is a wasteful number, since it uses less digits than its factorization.

129777390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3095 (or 3086 counting only the distinct ones).

The product of its (nonzero) digits is 166698, while the sum is 45.

The square root of 129777390 is about 11391.9879740105. The cubic root of 129777390 is about 506.2903836098.

It can be divided in two parts, 1297 and 77390, that added together give a palindrome (78687).

The spelling of 129777390 in words is "one hundred twenty-nine million, seven hundred seventy-seven thousand, three hundred ninety".