42859621 has 4 divisors (see below), whose sum is σ = 48982432. Its totient is φ = 36736812.

The previous prime is 42859613. The next prime is 42859627. The reversal of 42859621 is 12695824.

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 not a de Polignac number, because 42859621 - 2³ = 42859613 is a prime.

It is a super-2 number, since 2×42859621² = 3673894224527282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42859627) 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, 3061395 + ... + 3061408.

It is an arithmetic number, because the mean of its divisors is an integer number (12245608).

Almost surely, 2^42859621 is an apocalyptic number.

It is an amenable number.

42859621 is a deficient number, since it is larger than the sum of its proper divisors (6122811).

42859621 is an equidigital number, since it uses as much as digits as its factorization.

42859621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6122810.

The product of its digits is 34560, while the sum is 37.

The square root of 42859621 is about 6546.7259756309. The cubic root of 42859621 is about 349.9581473765.

The spelling of 42859621 in words is "forty-two million, eight hundred fifty-nine thousand, six hundred twenty-one".