42731145 has 20 divisors (see below), whose sum is σ = 76600260. Its totient is φ = 22789728.

The previous prime is 42731141. The next prime is 42731147. The reversal of 42731145 is 54113724.

It can be written as a sum of positive squares in 2 ways, for example, as 22155849 + 20575296 = 4707^2 + 4536^2 .

It is not a de Polignac number, because 42731145 - 2² = 42731141 is a prime.

It is a super-2 number, since 2×42731145² = 3651901506022050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (42731141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 52350 + ... + 53159.

It is an arithmetic number, because the mean of its divisors is an integer number (3830013).

Almost surely, 2^42731145 is an apocalyptic number.

42731145 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42731145 is a deficient number, since it is larger than the sum of its proper divisors (33869115).

42731145 is a wasteful number, since it uses less digits than its factorization.

42731145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105526 (or 105517 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 42731145 is about 6536.9063784026. The cubic root of 42731145 is about 349.6081192139.

Adding to 42731145 its reverse (54113724), we get a palindrome (96844869).

The spelling of 42731145 in words is "forty-two million, seven hundred thirty-one thousand, one hundred forty-five".