40219831 has 2 divisors, whose sum is σ = 40219832. Its totient is φ = 40219830.

The previous prime is 40219813. The next prime is 40219843. The reversal of 40219831 is 13891204.

It is a happy number.

Together with previous prime (40219813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40219831 - 2⁵ = 40219799 is a prime.

It is a super-2 number, since 2×40219831² = 3235269611337122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40219831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40219871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20109915 + 20109916.

It is an arithmetic number, because the mean of its divisors is an integer number (20109916).

Almost surely, 2^40219831 is an apocalyptic number.

40219831 is a deficient number, since it is larger than the sum of its proper divisors (1).

40219831 is an equidigital number, since it uses as much as digits as its factorization.

40219831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 40219831 is about 6341.9106742369. The cubic root of 40219831 is about 342.6205546455.

The spelling of 40219831 in words is "forty million, two hundred nineteen thousand, eight hundred thirty-one".