40351645 has 8 divisors (see below), whose sum is σ = 49730904. Its totient is φ = 31408704.

The previous prime is 40351613. The next prime is 40351651. The reversal of 40351645 is 54615304.

It can be written as a sum of positive squares in 4 ways, for example, as 23794884 + 16556761 = 4878^2 + 4069^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 40351645 - 2⁵ = 40351613 is a prime.

It is a super-3 number, since 3×40351645³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108874 + ... + 109243.

It is an arithmetic number, because the mean of its divisors is an integer number (6216363).

Almost surely, 2^40351645 is an apocalyptic number.

It is an amenable number.

40351645 is a deficient number, since it is larger than the sum of its proper divisors (9379259).

40351645 is a wasteful number, since it uses less digits than its factorization.

40351645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218159.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 40351645 is about 6352.2944673559. The cubic root of 40351645 is about 342.9944410016.

Adding to 40351645 its reverse (54615304), we get a palindrome (94966949).

The spelling of 40351645 in words is "forty million, three hundred fifty-one thousand, six hundred forty-five".