40821923 has 4 divisors (see below), whose sum is σ = 41513880. Its totient is φ = 40129968.

The previous prime is 40821919. The next prime is 40821929. The reversal of 40821923 is 32912804.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40821923 - 2² = 40821919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40821929) 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, 345890 + ... + 346007.

It is an arithmetic number, because the mean of its divisors is an integer number (10378470).

Almost surely, 2^40821923 is an apocalyptic number.

40821923 is a deficient number, since it is larger than the sum of its proper divisors (691957).

40821923 is an equidigital number, since it uses as much as digits as its factorization.

40821923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691956.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40821923 is about 6389.2036279962. The cubic root of 40821923 is about 344.3217733555.

The spelling of 40821923 in words is "forty million, eight hundred twenty-one thousand, nine hundred twenty-three".