42400421 has 8 divisors (see below), whose sum is σ = 48807360. Its totient is φ = 36080928.

The previous prime is 42400411. The next prime is 42400427. The reversal of 42400421 is 12400424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42400421 - 2⁶ = 42400357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42400421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42400427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20816 + ... + 22761.

It is an arithmetic number, because the mean of its divisors is an integer number (6100920).

Almost surely, 2^42400421 is an apocalyptic number.

It is an amenable number.

42400421 is a deficient number, since it is larger than the sum of its proper divisors (6406939).

42400421 is a wasteful number, since it uses less digits than its factorization.

42400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43723.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 42400421 is about 6511.5605656402. The cubic root of 42400421 is about 348.7038343674.

Adding to 42400421 its reverse (12400424), we get a palindrome (54800845).

The spelling of 42400421 in words is "forty-two million, four hundred thousand, four hundred twenty-one".