42731407 has 4 divisors (see below), whose sum is σ = 42758680. Its totient is φ = 42704136.

The previous prime is 42731371. The next prime is 42731419. The reversal of 42731407 is 70413724.

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 42731407 - 2¹¹ = 42729359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42731477) 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, 11133 + ... + 14470.

It is an arithmetic number, because the mean of its divisors is an integer number (10689670).

Almost surely, 2^42731407 is an apocalyptic number.

42731407 is a deficient number, since it is larger than the sum of its proper divisors (27273).

42731407 is a wasteful number, since it uses less digits than its factorization.

42731407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27272.

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

The square root of 42731407 is about 6536.9264184324. The cubic root of 42731407 is about 349.6088337367.

The spelling of 42731407 in words is "forty-two million, seven hundred thirty-one thousand, four hundred seven".