40026645 has 12 divisors (see below), whose sum is σ = 69379596. Its totient is φ = 21347520.

The previous prime is 40026643. The next prime is 40026659. The reversal of 40026645 is 54662004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24980004 + 15046641 = 4998^2 + 3879^2 .

It is not a de Polignac number, because 40026645 - 2¹ = 40026643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40026643) 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, 444696 + ... + 444785.

It is an arithmetic number, because the mean of its divisors is an integer number (5781633).

Almost surely, 2^40026645 is an apocalyptic number.

40026645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40026645 is a deficient number, since it is larger than the sum of its proper divisors (29352951).

40026645 is a wasteful number, since it uses less digits than its factorization.

40026645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889492 (or 889489 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 40026645 is about 6326.6614418665. The cubic root of 40026645 is about 342.0711096622.

Adding to 40026645 its reverse (54662004), we get a palindrome (94688649).

The spelling of 40026645 in words is "forty million, twenty-six thousand, six hundred forty-five".