42499999 has 2 divisors, whose sum is σ = 42500000. Its totient is φ = 42499998.

The previous prime is 42499991. The next prime is 42500023. The reversal of 42499999 is 99999424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42499999 - 2³ = 42499991 is a prime.

42499999 is a modest number, since divided by 9999 gives 4249 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42499991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21249999 + 21250000.

It is an arithmetic number, because the mean of its divisors is an integer number (21250000).

Almost surely, 2^42499999 is an apocalyptic number.

42499999 is a deficient number, since it is larger than the sum of its proper divisors (1).

42499999 is an equidigital number, since it uses as much as digits as its factorization.

42499999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 55.

The square root of 42499999 is about 6519.2023285061. The cubic root of 42499999 is about 348.9765996084.

The spelling of 42499999 in words is "forty-two million, four hundred ninety-nine thousand, nine hundred ninety-nine".