42740731 has 4 divisors (see below), whose sum is σ = 46626264. Its totient is φ = 38855200.

The previous prime is 42740729. The next prime is 42740741. The reversal of 42740731 is 13704724.

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 42740731 - 2¹ = 42740729 is a prime.

It is a super-2 number, since 2×42740731² = 3653540172828722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42740731.

It is not an unprimeable number, because it can be changed into a prime (42740741) 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, 1942750 + ... + 1942771.

It is an arithmetic number, because the mean of its divisors is an integer number (11656566).

Almost surely, 2^42740731 is an apocalyptic number.

42740731 is a deficient number, since it is larger than the sum of its proper divisors (3885533).

42740731 is a wasteful number, since it uses less digits than its factorization.

42740731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885532.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 42740731 is about 6537.6395587398. The cubic root of 42740731 is about 349.6342601224.

The spelling of 42740731 in words is "forty-two million, seven hundred forty thousand, seven hundred thirty-one".