42390743 has 4 divisors (see below), whose sum is σ = 42625128. Its totient is φ = 42156360.

The previous prime is 42390737. The next prime is 42390773. The reversal of 42390743 is 34709324.

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 42390743 - 2⁴ = 42390727 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 (42390773) 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, 116921 + ... + 117282.

It is an arithmetic number, because the mean of its divisors is an integer number (10656282).

Almost surely, 2^42390743 is an apocalyptic number.

42390743 is a deficient number, since it is larger than the sum of its proper divisors (234385).

42390743 is a wasteful number, since it uses less digits than its factorization.

42390743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234384.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 42390743 is about 6510.8173834013. The cubic root of 42390743 is about 348.6773015136.

The spelling of 42390743 in words is "forty-two million, three hundred ninety thousand, seven hundred forty-three".