42772987 has 2 divisors, whose sum is σ = 42772988. Its totient is φ = 42772986.

The previous prime is 42772981. The next prime is 42772991. The reversal of 42772987 is 78927724.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42772987 - 2⁷ = 42772859 is a prime.

It is not a weakly prime, because it can be changed into another prime (42772981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21386493 + 21386494.

It is an arithmetic number, because the mean of its divisors is an integer number (21386494).

Almost surely, 2^42772987 is an apocalyptic number.

42772987 is a deficient number, since it is larger than the sum of its proper divisors (1).

42772987 is an equidigital number, since it uses as much as digits as its factorization.

42772987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 46.

The square root of 42772987 is about 6540.1060388957. The cubic root of 42772987 is about 349.7221931591.

The spelling of 42772987 in words is "forty-two million, seven hundred seventy-two thousand, nine hundred eighty-seven".