42245391 has 16 divisors (see below), whose sum is σ = 59871744. Its totient is φ = 26404224.

The previous prime is 42245383. The next prime is 42245447. The reversal of 42245391 is 19354224.

It is not a de Polignac number, because 42245391 - 2³ = 42245383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42245311) 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, 12970 + ... + 15896.

It is an arithmetic number, because the mean of its divisors is an integer number (3741984).

Almost surely, 2^42245391 is an apocalyptic number.

42245391 is a deficient number, since it is larger than the sum of its proper divisors (17626353).

42245391 is a wasteful number, since it uses less digits than its factorization.

42245391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3230.

The product of its digits is 8640, while the sum is 30.

The square root of 42245391 is about 6499.6454518689. The cubic root of 42245391 is about 348.2783230565.

The spelling of 42245391 in words is "forty-two million, two hundred forty-five thousand, three hundred ninety-one".