398000131 has 4 divisors (see below), whose sum is σ = 407255992. Its totient is φ = 388744272.

The previous prime is 398000129. The next prime is 398000143. The reversal of 398000131 is 131000893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398000131 - 2¹ = 398000129 is a prime.

It is a super-2 number, since 2×398000131² = 316808208552034322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398000096 and 398000105.

It is not an unprimeable number, because it can be changed into a prime (398000101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4627866 + ... + 4627951.

It is an arithmetic number, because the mean of its divisors is an integer number (101813998).

Almost surely, 2^398000131 is an apocalyptic number.

398000131 is a deficient number, since it is larger than the sum of its proper divisors (9255861).

398000131 is an equidigital number, since it uses as much as digits as its factorization.

398000131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9255860.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 398000131 is about 19949.9406264781. The cubic root of 398000131 is about 735.5763175440.

The spelling of 398000131 in words is "three hundred ninety-eight million, one hundred thirty-one", and thus it is an aban number.