398461997 has 8 divisors (see below), whose sum is σ = 422739000. Its totient is φ = 374278144.

The previous prime is 398461981. The next prime is 398462021. The reversal of 398461997 is 799164893.

It can be written as a sum of positive squares in 4 ways, for example, as 52911076 + 345550921 = 7274^2 + 18589^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 398461997 - 2⁴ = 398461981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398461937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14372 + ... + 31677.

It is an arithmetic number, because the mean of its divisors is an integer number (52842375).

Almost surely, 2^398461997 is an apocalyptic number.

It is an amenable number.

398461997 is a deficient number, since it is larger than the sum of its proper divisors (24277003).

398461997 is a wasteful number, since it uses less digits than its factorization.

398461997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46575.

The product of its digits is 2939328, while the sum is 56.

The square root of 398461997 is about 19961.5128935660. The cubic root of 398461997 is about 735.8607448859.

The spelling of 398461997 in words is "three hundred ninety-eight million, four hundred sixty-one thousand, nine hundred ninety-seven".