398218077 has 12 divisors (see below), whose sum is σ = 581135100. Its totient is φ = 262741248.

The previous prime is 398218069. The next prime is 398218099. The reversal of 398218077 is 770812893.

It can be written as a sum of positive squares in 2 ways, for example, as 273538521 + 124679556 = 16539^2 + 11166^2 .

It is not a de Polignac number, because 398218077 - 2³ = 398218069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398218057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227202 + ... + 228947.

It is an arithmetic number, because the mean of its divisors is an integer number (48427925).

Almost surely, 2^398218077 is an apocalyptic number.

It is an amenable number.

398218077 is a deficient number, since it is larger than the sum of its proper divisors (182917023).

398218077 is a wasteful number, since it uses less digits than its factorization.

398218077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456252 (or 456249 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 398218077 is about 19955.4022009079. The cubic root of 398218077 is about 735.7105609352.

The spelling of 398218077 in words is "three hundred ninety-eight million, two hundred eighteen thousand, seventy-seven".