398837036861 has 4 divisors (see below), whose sum is σ = 408112316832. Its totient is φ = 389561756892.

The previous prime is 398837036827. The next prime is 398837036863. The reversal of 398837036861 is 168630738893.

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.

It is a cyclic number.

It is not a de Polignac number, because 398837036861 - 2⁶ = 398837036797 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398837036794 and 398837036803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398837036863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4637639921 + ... + 4637640006.

It is an arithmetic number, because the mean of its divisors is an integer number (102028079208).

Almost surely, 2^398837036861 is an apocalyptic number.

It is an amenable number.

398837036861 is a deficient number, since it is larger than the sum of its proper divisors (9275279971).

398837036861 is an equidigital number, since it uses as much as digits as its factorization.

398837036861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9275279970.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 398837036861 in words is "three hundred ninety-eight billion, eight hundred thirty-seven million, thirty-six thousand, eight hundred sixty-one".