42072733 has 4 divisors (see below), whose sum is σ = 42101280. Its totient is φ = 42044188.

The previous prime is 42072731. The next prime is 42072763. The reversal of 42072733 is 33727024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42072733 - 2¹ = 42072731 is a prime.

It is a super-2 number, since 2×42072733² = 3540229724178578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42072731) 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, 11935 + ... + 15052.

It is an arithmetic number, because the mean of its divisors is an integer number (10525320).

Almost surely, 2^42072733 is an apocalyptic number.

It is an amenable number.

42072733 is a deficient number, since it is larger than the sum of its proper divisors (28547).

42072733 is a wasteful number, since it uses less digits than its factorization.

42072733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28546.

The product of its (nonzero) digits is 7056, while the sum is 28.

The square root of 42072733 is about 6486.3497438852. The cubic root of 42072733 is about 347.8032010329.

Adding to 42072733 its reverse (33727024), we get a palindrome (75799757).

It can be divided in two parts, 420 and 72733, that added together give a triangular number (73153 = T₃₈₂).

The spelling of 42072733 in words is "forty-two million, seventy-two thousand, seven hundred thirty-three".