42723421 has 16 divisors (see below), whose sum is σ = 47127808. Its totient is φ = 38491200.

The previous prime is 42723413. The next prime is 42723433. The reversal of 42723421 is 12432724.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 42723421 - 2³ = 42723413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42723221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157516 + ... + 157786.

It is an arithmetic number, because the mean of its divisors is an integer number (2945488).

Almost surely, 2^42723421 is an apocalyptic number.

It is an amenable number.

42723421 is a deficient number, since it is larger than the sum of its proper divisors (4404387).

42723421 is a wasteful number, since it uses less digits than its factorization.

42723421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532.

The product of its digits is 2688, while the sum is 25.

The square root of 42723421 is about 6536.3155523582. The cubic root of 42723421 is about 349.5870531130.

The spelling of 42723421 in words is "forty-two million, seven hundred twenty-three thousand, four hundred twenty-one".