398078587 has 2 divisors, whose sum is σ = 398078588. Its totient is φ = 398078586.

The previous prime is 398078537. The next prime is 398078617. The reversal of 398078587 is 785870893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398078587 - 2⁷ = 398078459 is a prime.

It is a super-2 number, since 2×398078587² = 316933122855833138, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398078507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199039293 + 199039294.

It is an arithmetic number, because the mean of its divisors is an integer number (199039294).

Almost surely, 2^398078587 is an apocalyptic number.

398078587 is a deficient number, since it is larger than the sum of its proper divisors (1).

398078587 is an equidigital number, since it uses as much as digits as its factorization.

398078587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The square root of 398078587 is about 19951.9068512260. The cubic root of 398078587 is about 735.6246480004.

The spelling of 398078587 in words is "three hundred ninety-eight million, seventy-eight thousand, five hundred eighty-seven".