40708821 has 4 divisors (see below), whose sum is σ = 54278432. Its totient is φ = 27139212.

The previous prime is 40708819. The next prime is 40708853. The reversal of 40708821 is 12880704.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40708821 - 2¹ = 40708819 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40708861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6784801 + ... + 6784806.

It is an arithmetic number, because the mean of its divisors is an integer number (13569608).

Almost surely, 2^40708821 is an apocalyptic number.

It is an amenable number.

40708821 is a deficient number, since it is larger than the sum of its proper divisors (13569611).

40708821 is a wasteful number, since it uses less digits than its factorization.

40708821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13569610.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 40708821 is about 6380.3464639469. The cubic root of 40708821 is about 344.0034843932.

The spelling of 40708821 in words is "forty million, seven hundred eight thousand, eight hundred twenty-one".