42721727 has 8 divisors (see below), whose sum is σ = 44496000. Its totient is φ = 40967584.

The previous prime is 42721711. The next prime is 42721733. The reversal of 42721727 is 72712724.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42721727 - 2⁴ = 42721711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42721693 and 42721702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721027) 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, 623 + ... + 9264.

It is an arithmetic number, because the mean of its divisors is an integer number (5562000).

Almost surely, 2^42721727 is an apocalyptic number.

42721727 is a deficient number, since it is larger than the sum of its proper divisors (1774273).

42721727 is a wasteful number, since it uses less digits than its factorization.

42721727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10065.

The product of its digits is 10976, while the sum is 32.

The square root of 42721727 is about 6536.1859673666. The cubic root of 42721727 is about 349.5824326318.

The spelling of 42721727 in words is "forty-two million, seven hundred twenty-one thousand, seven hundred twenty-seven".