2198731 has 4 divisors (see below), whose sum is σ = 2294352. Its totient is φ = 2103112.

The previous prime is 2198723. The next prime is 2198747. The reversal of 2198731 is 1378912.

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 2198731 - 2³ = 2198723 is a prime.

It is a super-2 number, since 2×2198731² = 9668836020722, 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 = 2198693 and 2198702.

It is not an unprimeable number, because it can be changed into a prime (2198701) 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, 47776 + ... + 47821.

It is an arithmetic number, because the mean of its divisors is an integer number (573588).

2^2198731 is an apocalyptic number.

2198731 is a deficient number, since it is larger than the sum of its proper divisors (95621).

2198731 is an equidigital number, since it uses as much as digits as its factorization.

2198731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95620.

The product of its digits is 3024, while the sum is 31.

The square root of 2198731 is about 1482.8118559008. The cubic root of 2198731 is about 130.0341330490.

The spelling of 2198731 in words is "two million, one hundred ninety-eight thousand, seven hundred thirty-one".