129783645 has 12 divisors (see below), whose sum is σ = 224958396. Its totient is φ = 69217920.

The previous prime is 129783631. The next prime is 129783653. The reversal of 129783645 is 546387921.

It can be written as a sum of positive squares in 2 ways, for example, as 72539289 + 57244356 = 8517^2 + 7566^2 .

It is not a de Polignac number, because 129783645 - 2⁶ = 129783581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 2884081 = 129783645 / (1 + 2 + 9 + 7 + 8 + 3 + 6 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 129783645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1441996 + ... + 1442085.

It is an arithmetic number, because the mean of its divisors is an integer number (18746533).

Almost surely, 2^129783645 is an apocalyptic number.

129783645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129783645 is a deficient number, since it is larger than the sum of its proper divisors (95174751).

129783645 is a wasteful number, since it uses less digits than its factorization.

129783645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884092 (or 2884089 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 129783645 is about 11392.2625057536. The cubic root of 129783645 is about 506.2985175266.

The spelling of 129783645 in words is "one hundred twenty-nine million, seven hundred eighty-three thousand, six hundred forty-five".