434639987 has 2 divisors, whose sum is σ = 434639988. Its totient is φ = 434639986.

The previous prime is 434639983. The next prime is 434640043. The reversal of 434639987 is 789936434.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 434639987 - 2² = 434639983 is a prime.

It is not a weakly prime, because it can be changed into another prime (434639981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217319993 + 217319994.

It is an arithmetic number, because the mean of its divisors is an integer number (217319994).

Almost surely, 2^434639987 is an apocalyptic number.

434639987 is a deficient number, since it is larger than the sum of its proper divisors (1).

434639987 is an equidigital number, since it uses as much as digits as its factorization.

434639987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 53.

The square root of 434639987 is about 20848.0211770806. The cubic root of 434639987 is about 757.4893996563.

The spelling of 434639987 in words is "four hundred thirty-four million, six hundred thirty-nine thousand, nine hundred eighty-seven".