129478740 has 48 divisors (see below), whose sum is σ = 363279168. Its totient is φ = 34457344.

The previous prime is 129478733. The next prime is 129478759. The reversal of 129478740 is 47874921.

It is a happy number.

It is a super-2 number, since 2×129478740² = 33529488223975200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129478692 and 129478701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31864 + ... + 35696.

It is an arithmetic number, because the mean of its divisors is an integer number (7568316).

Almost surely, 2^129478740 is an apocalyptic number.

129478740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129478740 is an abundant number, since it is smaller than the sum of its proper divisors (233800428).

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

129478740 is a wasteful number, since it uses less digits than its factorization.

129478740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4408 (or 4406 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 129478740 is about 11378.8725276277. The cubic root of 129478740 is about 505.9017186883.

The spelling of 129478740 in words is "one hundred twenty-nine million, four hundred seventy-eight thousand, seven hundred forty".