42229731 has 4 divisors (see below), whose sum is σ = 56306312. Its totient is φ = 28153152.

The previous prime is 42229709. The next prime is 42229739. The reversal of 42229731 is 13792224.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42229731 - 2⁶ = 42229667 is a prime.

It is a super-2 number, since 2×42229731² = 3566700360664722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42229739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7038286 + ... + 7038291.

It is an arithmetic number, because the mean of its divisors is an integer number (14076578).

Almost surely, 2^42229731 is an apocalyptic number.

42229731 is a deficient number, since it is larger than the sum of its proper divisors (14076581).

42229731 is a wasteful number, since it uses less digits than its factorization.

42229731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14076580.

The product of its digits is 6048, while the sum is 30.

The square root of 42229731 is about 6498.4406591120. The cubic root of 42229731 is about 348.2352831535.

The spelling of 42229731 in words is "forty-two million, two hundred twenty-nine thousand, seven hundred thirty-one".