40039641 has 12 divisors (see below), whose sum is σ = 61237332. Its totient is φ = 25122816.

The previous prime is 40039627. The next prime is 40039651. The reversal of 40039641 is 14693004.

It can be written as a sum of positive squares in 2 ways, for example, as 36723600 + 3316041 = 6060^2 + 1821^2 .

It is not a de Polignac number, because 40039641 - 2¹⁸ = 39777497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40039621) 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, 130696 + ... + 131001.

It is an arithmetic number, because the mean of its divisors is an integer number (5103111).

Almost surely, 2^40039641 is an apocalyptic number.

It is an amenable number.

40039641 is a deficient number, since it is larger than the sum of its proper divisors (21197691).

40039641 is a wasteful number, since it uses less digits than its factorization.

40039641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261720 (or 261717 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 40039641 is about 6327.6884404971. The cubic root of 40039641 is about 342.1081272963.

The spelling of 40039641 in words is "forty million, thirty-nine thousand, six hundred forty-one".