42724905 has 8 divisors (see below), whose sum is σ = 68359872. Its totient is φ = 22786608.

The previous prime is 42724897. The next prime is 42724907. The reversal of 42724905 is 50942724.

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

It is not a de Polignac number, because 42724905 - 2³ = 42724897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42724907) 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, 1424149 + ... + 1424178.

It is an arithmetic number, because the mean of its divisors is an integer number (8544984).

Almost surely, 2^42724905 is an apocalyptic number.

It is an amenable number.

42724905 is a deficient number, since it is larger than the sum of its proper divisors (25634967).

42724905 is a wasteful number, since it uses less digits than its factorization.

42724905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848335.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 42724905 is about 6536.4290709836. The cubic root of 42724905 is about 349.5911007069.

The spelling of 42724905 in words is "forty-two million, seven hundred twenty-four thousand, nine hundred five".