40490231 has 4 divisors (see below), whose sum is σ = 40503000. Its totient is φ = 40477464.

The previous prime is 40490183. The next prime is 40490249. The reversal of 40490231 is 13209404.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40490231 - 2⁶ = 40490167 is a prime.

It is a super-2 number, since 2×40490231² = 3278917612866722, 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 = 40490197 and 40490206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40490291) 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, 2420 + ... + 9318.

It is an arithmetic number, because the mean of its divisors is an integer number (10125750).

Almost surely, 2^40490231 is an apocalyptic number.

40490231 is a deficient number, since it is larger than the sum of its proper divisors (12769).

40490231 is an equidigital number, since it uses as much as digits as its factorization.

40490231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12768.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40490231 is about 6363.1934592624. The cubic root of 40490231 is about 343.3866589075.

Adding to 40490231 its reverse (13209404), we get a palindrome (53699635).

The spelling of 40490231 in words is "forty million, four hundred ninety thousand, two hundred thirty-one".