2209431 has 8 divisors (see below), whose sum is σ = 3366784. Its totient is φ = 1262520.

The previous prime is 2209421. The next prime is 2209447. The reversal of 2209431 is 1349022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2209431 - 2¹⁰ = 2208407 is a prime.

It is a super-2 number, since 2×2209431² = 9763170687522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 105211 = 2209431 / (2 + 2 + 0 + 9 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2209398 and 2209407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52585 + ... + 52626.

It is an arithmetic number, because the mean of its divisors is an integer number (420848).

2^2209431 is an apocalyptic number.

2209431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2209431 is a deficient number, since it is larger than the sum of its proper divisors (1157353).

2209431 is a wasteful number, since it uses less digits than its factorization.

2209431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105221.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 2209431 is about 1486.4154870022. The cubic root of 2209431 is about 130.2447263876.

The spelling of 2209431 in words is "two million, two hundred nine thousand, four hundred thirty-one".