398006997 has 8 divisors (see below), whose sum is σ = 530902656. Its totient is φ = 265224672.

The previous prime is 398006989. The next prime is 398007013. The reversal of 398006997 is 799600893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398006997 - 2³ = 398006989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398006597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19768 + ... + 34449.

It is an arithmetic number, because the mean of its divisors is an integer number (66362832).

Almost surely, 2^398006997 is an apocalyptic number.

It is an amenable number.

398006997 is a deficient number, since it is larger than the sum of its proper divisors (132895659).

398006997 is a wasteful number, since it uses less digits than its factorization.

398006997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56667.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 398006997 is about 19950.1127064486. The cubic root of 398006997 is about 735.5805473902.

It can be divided in two parts, 3 and 98006997, that added together give a triangular number (98007000 = T₁₄₀₀₀).

The spelling of 398006997 in words is "three hundred ninety-eight million, six thousand, nine hundred ninety-seven".