42633979 has 2 divisors, whose sum is σ = 42633980. Its totient is φ = 42633978.

The previous prime is 42633961. The next prime is 42634003. The reversal of 42633979 is 97933624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42633979 - 2²³ = 34245371 is a prime.

It is not a weakly prime, because it can be changed into another prime (42633949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21316989 + 21316990.

It is an arithmetic number, because the mean of its divisors is an integer number (21316990).

Almost surely, 2^42633979 is an apocalyptic number.

42633979 is a deficient number, since it is larger than the sum of its proper divisors (1).

42633979 is an equidigital number, since it uses as much as digits as its factorization.

42633979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 43.

The square root of 42633979 is about 6529.4700397505. The cubic root of 42633979 is about 349.3429277621.

The spelling of 42633979 in words is "forty-two million, six hundred thirty-three thousand, nine hundred seventy-nine".