40808121 has 16 divisors (see below), whose sum is σ = 56340480. Its totient is φ = 26246160.

The previous prime is 40808101. The next prime is 40808137. The reversal of 40808121 is 12180804.

It is not a de Polignac number, because 40808121 - 2¹⁵ = 40775353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40808091 and 40808100.

It is not an unprimeable number, because it can be changed into a prime (40808101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48220 + ... + 49058.

It is an arithmetic number, because the mean of its divisors is an integer number (3521280).

Almost surely, 2^40808121 is an apocalyptic number.

It is an amenable number.

40808121 is a deficient number, since it is larger than the sum of its proper divisors (15532359).

40808121 is a wasteful number, since it uses less digits than its factorization.

40808121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 40808121 is about 6388.1234333723. The cubic root of 40808121 is about 344.2829636142.

Adding to 40808121 its reverse (12180804), we get a palindrome (52988925).

The spelling of 40808121 in words is "forty million, eight hundred eight thousand, one hundred twenty-one".