42398642 has 24 divisors (see below), whose sum is σ = 75288108. Its totient is φ = 17788320.

The previous prime is 42398627. The next prime is 42398651. The reversal of 42398642 is 24689324.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41977441 + 421201 = 6479^2 + 649^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42398596 and 42398605.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3593 + ... + 9884.

Almost surely, 2^42398642 is an apocalyptic number.

42398642 is a deficient number, since it is larger than the sum of its proper divisors (32889466).

42398642 is a wasteful number, since it uses less digits than its factorization.

42398642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13514 (or 13503 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 42398642 is about 6511.4239610088. The cubic root of 42398642 is about 348.6989574284.

The spelling of 42398642 in words is "forty-two million, three hundred ninety-eight thousand, six hundred forty-two".