400020587 has 2 divisors, whose sum is σ = 400020588. Its totient is φ = 400020586.

The previous prime is 400020581. The next prime is 400020589. The reversal of 400020587 is 785020004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400020587 - 2²⁶ = 332911723 is a prime.

Together with 400020589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400020581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200010293 + 200010294.

It is an arithmetic number, because the mean of its divisors is an integer number (200010294).

Almost surely, 2^400020587 is an apocalyptic number.

400020587 is a deficient number, since it is larger than the sum of its proper divisors (1).

400020587 is an equidigital number, since it uses as much as digits as its factorization.

400020587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 400020587 is about 20000.5146683779. The cubic root of 400020587 is about 736.8189400373.

The spelling of 400020587 in words is "four hundred million, twenty thousand, five hundred eighty-seven".