42278621 has 12 divisors (see below), whose sum is σ = 53652960. Its totient is φ = 32943960.

The previous prime is 42278617. The next prime is 42278627. The reversal of 42278621 is 12687224.

It is not a de Polignac number, because 42278621 - 2² = 42278617 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 (42278627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38681 + ... + 39758.

It is an arithmetic number, because the mean of its divisors is an integer number (4471080).

Almost surely, 2^42278621 is an apocalyptic number.

It is an amenable number.

42278621 is a deficient number, since it is larger than the sum of its proper divisors (11374339).

42278621 is a wasteful number, since it uses less digits than its factorization.

42278621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78464 (or 78457 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 42278621 is about 6502.2012426562. The cubic root of 42278621 is about 348.3696170828.

The spelling of 42278621 in words is "forty-two million, two hundred seventy-eight thousand, six hundred twenty-one".