398117582 has 4 divisors (see below), whose sum is σ = 597176376. Its totient is φ = 199058790.

The previous prime is 398117581. The next prime is 398117591. The reversal of 398117582 is 285711893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 285711893 = 4673 ⋅61141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398117581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99529394 + ... + 99529397.

It is an arithmetic number, because the mean of its divisors is an integer number (149294094).

Almost surely, 2^398117582 is an apocalyptic number.

398117582 is a deficient number, since it is larger than the sum of its proper divisors (199058794).

398117582 is a wasteful number, since it uses less digits than its factorization.

398117582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199058793.

The product of its digits is 120960, while the sum is 44.

The square root of 398117582 is about 19952.8840521865. The cubic root of 398117582 is about 735.6486673335.

The spelling of 398117582 in words is "three hundred ninety-eight million, one hundred seventeen thousand, five hundred eighty-two".