42119989 has 2 divisors, whose sum is σ = 42119990. Its totient is φ = 42119988.

The previous prime is 42119981. The next prime is 42119993. The reversal of 42119989 is 98991124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29517489 + 12602500 = 5433^2 + 3550^2 .

It is a cyclic number.

It is not a de Polignac number, because 42119989 - 2³ = 42119981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42119981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21059994 + 21059995.

It is an arithmetic number, because the mean of its divisors is an integer number (21059995).

Almost surely, 2^42119989 is an apocalyptic number.

It is an amenable number.

42119989 is a deficient number, since it is larger than the sum of its proper divisors (1).

42119989 is an equidigital number, since it uses as much as digits as its factorization.

42119989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 43.

The square root of 42119989 is about 6489.9914483765. The cubic root of 42119989 is about 347.9333695703.

The spelling of 42119989 in words is "forty-two million, one hundred nineteen thousand, nine hundred eighty-nine".