40312643 has 12 divisors (see below), whose sum is σ = 47666592. Its totient is φ = 33984720.

The previous prime is 40312603. The next prime is 40312681. The reversal of 40312643 is 34621304.

It is a happy number.

It is not a de Polignac number, because 40312643 - 2¹⁰ = 40311619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40312603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3755 + ... + 9732.

It is an arithmetic number, because the mean of its divisors is an integer number (3972216).

Almost surely, 2^40312643 is an apocalyptic number.

40312643 is a deficient number, since it is larger than the sum of its proper divisors (7353949).

40312643 is a wasteful number, since it uses less digits than its factorization.

40312643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13562 (or 13555 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 40312643 is about 6349.2238108292. The cubic root of 40312643 is about 342.8838979534.

Adding to 40312643 its reverse (34621304), we get a palindrome (74933947).

The spelling of 40312643 in words is "forty million, three hundred twelve thousand, six hundred forty-three".