398449787 has 2 divisors, whose sum is σ = 398449788. Its totient is φ = 398449786.

The previous prime is 398449783. The next prime is 398449801. The reversal of 398449787 is 787944893.

It is a weak prime.

It is an emirp because it is prime and its reverse (787944893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398449787 - 2² = 398449783 is a prime.

It is a super-3 number, since 3×398449787³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (398449783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199224893 + 199224894.

It is an arithmetic number, because the mean of its divisors is an integer number (199224894).

Almost surely, 2^398449787 is an apocalyptic number.

398449787 is a deficient number, since it is larger than the sum of its proper divisors (1).

398449787 is an equidigital number, since it uses as much as digits as its factorization.

398449787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 59.

The square root of 398449787 is about 19961.2070526810. The cubic root of 398449787 is about 735.8532285259.

The spelling of 398449787 in words is "three hundred ninety-eight million, four hundred forty-nine thousand, seven hundred eighty-seven".