43213431 has 8 divisors (see below), whose sum is σ = 57656704. Its totient is φ = 28789560.

The previous prime is 43213399. The next prime is 43213441. The reversal of 43213431 is 13431234.

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

It is not a de Polignac number, because 43213431 - 2⁵ = 43213399 is a prime.

It is a super-2 number, since 2×43213431² = 3734801237583522, 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 = 43213398 and 43213407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43213441) 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, 1560 + ... + 9426.

It is an arithmetic number, because the mean of its divisors is an integer number (7207088).

Almost surely, 2^43213431 is an apocalyptic number.

43213431 is a deficient number, since it is larger than the sum of its proper divisors (14443273).

43213431 is a wasteful number, since it uses less digits than its factorization.

43213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9701.

The product of its digits is 864, while the sum is 21.

The square root of 43213431 is about 6573.6923414471. The cubic root of 43213431 is about 350.9184882272.

Adding to 43213431 its reverse (13431234), we get a palindrome (56644665).

The spelling of 43213431 in words is "forty-three million, two hundred thirteen thousand, four hundred thirty-one".