40103721 has 32 divisors (see below), whose sum is σ = 68935680. Its totient is φ = 22567248.

The previous prime is 40103683. The next prime is 40103741. The reversal of 40103721 is 12730104.

It is not a de Polignac number, because 40103721 - 2⁷ = 40103593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40103694 and 40103703.

It is not an unprimeable number, because it can be changed into a prime (40103741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11080 + ... + 14246.

It is an arithmetic number, because the mean of its divisors is an integer number (2154240).

Almost surely, 2^40103721 is an apocalyptic number.

It is an amenable number.

40103721 is a deficient number, since it is larger than the sum of its proper divisors (28831959).

40103721 is a wasteful number, since it uses less digits than its factorization.

40103721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3250 (or 3244 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 40103721 is about 6332.7498766334. The cubic root of 40103721 is about 342.2905348947.

Adding to 40103721 its reverse (12730104), we get a palindrome (52833825).

The spelling of 40103721 in words is "forty million, one hundred three thousand, seven hundred twenty-one".