40821819 has 16 divisors (see below), whose sum is σ = 56231712. Its totient is φ = 26327808.

The previous prime is 40821799. The next prime is 40821829. The reversal of 40821819 is 91812804.

It is not a de Polignac number, because 40821819 - 2⁵ = 40821787 is a prime.

It is a super-2 number, since 2×40821819² = 3332841812937522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40821819.

It is not an unprimeable number, because it can be changed into a prime (40821829) 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, 9849 + ... + 13365.

It is an arithmetic number, because the mean of its divisors is an integer number (3514482).

Almost surely, 2^40821819 is an apocalyptic number.

40821819 is a deficient number, since it is larger than the sum of its proper divisors (15409893).

40821819 is a wasteful number, since it uses less digits than its factorization.

40821819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 40821819 is about 6389.1954892615. The cubic root of 40821819 is about 344.3214809513.

The spelling of 40821819 in words is "forty million, eight hundred twenty-one thousand, eight hundred nineteen".