40988821 has 4 divisors (see below), whose sum is σ = 41003200. Its totient is φ = 40974444.

The previous prime is 40988809. The next prime is 40988837. The reversal of 40988821 is 12888904.

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 a cyclic number.

It is not a de Polignac number, because 40988821 - 2⁷ = 40988693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40988881) 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, 1311 + ... + 9148.

It is an arithmetic number, because the mean of its divisors is an integer number (10250800).

Almost surely, 2^40988821 is an apocalyptic number.

It is an amenable number.

40988821 is a deficient number, since it is larger than the sum of its proper divisors (14379).

40988821 is a wasteful number, since it uses less digits than its factorization.

40988821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14378.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 40988821 is about 6402.2512446795. The cubic root of 40988821 is about 344.7903816606.

The spelling of 40988821 in words is "forty million, nine hundred eighty-eight thousand, eight hundred twenty-one".