42672421 has 4 divisors (see below), whose sum is σ = 46551744. Its totient is φ = 38793100.

The previous prime is 42672419. The next prime is 42672437. The reversal of 42672421 is 12427624.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42672421 - 2¹ = 42672419 is a prime.

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 42672421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42672451) 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, 1939645 + ... + 1939666.

It is an arithmetic number, because the mean of its divisors is an integer number (11637936).

Almost surely, 2^42672421 is an apocalyptic number.

It is an amenable number.

42672421 is a deficient number, since it is larger than the sum of its proper divisors (3879323).

42672421 is a wasteful number, since it uses less digits than its factorization.

42672421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3879322.

The product of its digits is 5376, while the sum is 28.

The square root of 42672421 is about 6532.4131069613. The cubic root of 42672421 is about 349.4478941671.

The spelling of 42672421 in words is "forty-two million, six hundred seventy-two thousand, four hundred twenty-one".