42744631 has 4 divisors (see below), whose sum is σ = 43007032. Its totient is φ = 42482232.

The previous prime is 42744607. The next prime is 42744641. The reversal of 42744631 is 13644724.

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

It is a cyclic number.

It is not a de Polignac number, because 42744631 - 2⁵ = 42744599 is a prime.

It is a super-2 number, since 2×42744631² = 3654206958652322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42744593 and 42744602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42744641) 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, 130956 + ... + 131281.

It is an arithmetic number, because the mean of its divisors is an integer number (10751758).

Almost surely, 2^42744631 is an apocalyptic number.

42744631 is a deficient number, since it is larger than the sum of its proper divisors (262401).

42744631 is a wasteful number, since it uses less digits than its factorization.

42744631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262400.

The product of its digits is 16128, while the sum is 31.

The square root of 42744631 is about 6537.9378247273. The cubic root of 42744631 is about 349.6448942576.

The spelling of 42744631 in words is "forty-two million, seven hundred forty-four thousand, six hundred thirty-one".