42908429 has 8 divisors (see below), whose sum is σ = 45227160. Its totient is φ = 40645696.

The previous prime is 42908423. The next prime is 42908431. The reversal of 42908429 is 92480924.

It can be written as a sum of positive squares in 4 ways, for example, as 21996100 + 20912329 = 4690^2 + 4573^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42908429 is a prime.

It is a super-2 number, since 2×42908429² = 3682266558496082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42908392 and 42908401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42908423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12422 + ... + 15495.

It is an arithmetic number, because the mean of its divisors is an integer number (5653395).

Almost surely, 2^42908429 is an apocalyptic number.

It is an amenable number.

42908429 is a deficient number, since it is larger than the sum of its proper divisors (2318731).

42908429 is a wasteful number, since it uses less digits than its factorization.

42908429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27999.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 42908429 is about 6550.4525797841. The cubic root of 42908429 is about 350.0909396346.

The spelling of 42908429 in words is "forty-two million, nine hundred eight thousand, four hundred twenty-nine".