398890361 has 4 divisors (see below), whose sum is σ = 411757824. Its totient is φ = 386022900.

The previous prime is 398890333. The next prime is 398890379. The reversal of 398890361 is 163098893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 163098893 = 179 ⋅911167.

It is a cyclic number.

It is not a de Polignac number, because 398890361 - 2²⁶ = 331781497 is a prime.

It is a super-2 number, since 2×398890361² = 318227040197420642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (398890301) 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 3 ways as a sum of consecutive naturals, for example, 6433685 + ... + 6433746.

It is an arithmetic number, because the mean of its divisors is an integer number (102939456).

Almost surely, 2^398890361 is an apocalyptic number.

398890361 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

398890361 is a deficient number, since it is larger than the sum of its proper divisors (12867463).

398890361 is a wasteful number, since it uses less digits than its factorization.

398890361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12867462.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 398890361 is about 19972.2397592258. The cubic root of 398890361 is about 736.1243445641.

It can be divided in two parts, 3988 and 90361, that added together give a palindrome (94349).

The spelling of 398890361 in words is "three hundred ninety-eight million, eight hundred ninety thousand, three hundred sixty-one".