40113621 has 12 divisors (see below), whose sum is σ = 59355660. Its totient is φ = 26089920.

The previous prime is 40113589. The next prime is 40113643. The reversal of 40113621 is 12631104.

It is a happy number.

40113621 is a `hidden beast` number, since 40 + 1 + 1 + 3 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8910225 + 31203396 = 2985^2 + 5586^2 .

It is not a de Polignac number, because 40113621 - 2⁵ = 40113589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40113594 and 40113603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40113221) 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, 53986 + ... + 54723.

It is an arithmetic number, because the mean of its divisors is an integer number (4946305).

Almost surely, 2^40113621 is an apocalyptic number.

40113621 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40113621 is a deficient number, since it is larger than the sum of its proper divisors (19242039).

40113621 is a wasteful number, since it uses less digits than its factorization.

40113621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108756 (or 108753 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 40113621 is about 6333.5314793565. The cubic root of 40113621 is about 342.3186985115.

Adding to 40113621 its reverse (12631104), we get a palindrome (52744725).

The spelling of 40113621 in words is "forty million, one hundred thirteen thousand, six hundred twenty-one".