40491831 has 8 divisors (see below), whose sum is σ = 56830720. Its totient is φ = 25573752.

The previous prime is 40491827. The next prime is 40491833. The reversal of 40491831 is 13819404.

It is a happy number.

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

It is not a de Polignac number, because 40491831 - 2² = 40491827 is a prime.

It is a super-2 number, since 2×40491831² = 3279176755465122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40491833) 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, 355135 + ... + 355248.

It is an arithmetic number, because the mean of its divisors is an integer number (7103840).

Almost surely, 2^40491831 is an apocalyptic number.

40491831 is a deficient number, since it is larger than the sum of its proper divisors (16338889).

40491831 is a wasteful number, since it uses less digits than its factorization.

40491831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710405.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 40491831 is about 6363.3191810564. The cubic root of 40491831 is about 343.3911819032.

It can be divided in two parts, 404 and 91831, that added together give a triangular number (92235 = T₄₂₉).

The spelling of 40491831 in words is "forty million, four hundred ninety-one thousand, eight hundred thirty-one".