40030831 has 4 divisors (see below), whose sum is σ = 40043664. Its totient is φ = 40018000.

The previous prime is 40030819. The next prime is 40030867. The reversal of 40030831 is 13803004.

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 a de Polignac number, because none of the positive numbers 2^k-40030831 is a prime.

It is a super-2 number, since 2×40030831² = 3204934861101122, 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 = 40030799 and 40030808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40030811) 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, 1611 + ... + 9091.

It is an arithmetic number, because the mean of its divisors is an integer number (10010916).

Almost surely, 2^40030831 is an apocalyptic number.

40030831 is a deficient number, since it is larger than the sum of its proper divisors (12833).

40030831 is an equidigital number, since it uses as much as digits as its factorization.

40030831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12832.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 40030831 is about 6326.9922554086. The cubic root of 40030831 is about 342.0830338838.

Adding to 40030831 its reverse (13803004), we get a palindrome (53833835).

The spelling of 40030831 in words is "forty million, thirty thousand, eight hundred thirty-one".