42220397 has 4 divisors (see below), whose sum is σ = 42240576. Its totient is φ = 42200220.

The previous prime is 42220393. The next prime is 42220463. The reversal of 42220397 is 79302224.

It is a happy number.

42220397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42220397 - 2² = 42220393 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 (42220393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6533 + ... + 11274.

It is an arithmetic number, because the mean of its divisors is an integer number (10560144).

Almost surely, 2^42220397 is an apocalyptic number.

It is an amenable number.

42220397 is a deficient number, since it is larger than the sum of its proper divisors (20179).

42220397 is a wasteful number, since it uses less digits than its factorization.

42220397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20178.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 42220397 is about 6497.7224471348. The cubic root of 42220397 is about 348.2096245510.

The spelling of 42220397 in words is "forty-two million, two hundred twenty thousand, three hundred ninety-seven".