40821929 has 2 divisors, whose sum is σ = 40821930. Its totient is φ = 40821928.

The previous prime is 40821919. The next prime is 40821931. The reversal of 40821929 is 92912804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37027225 + 3794704 = 6085^2 + 1948^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40821929 is a prime.

Together with 40821931, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40821919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20410964 + 20410965.

It is an arithmetic number, because the mean of its divisors is an integer number (20410965).

Almost surely, 2^40821929 is an apocalyptic number.

It is an amenable number.

40821929 is a deficient number, since it is larger than the sum of its proper divisors (1).

40821929 is an equidigital number, since it uses as much as digits as its factorization.

40821929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 40821929 is about 6389.2040975383. The cubic root of 40821929 is about 344.3217902249.

The spelling of 40821929 in words is "forty million, eight hundred twenty-one thousand, nine hundred twenty-nine".