40223821 has 8 divisors (see below), whose sum is σ = 44227584. Its totient is φ = 36277920.

The previous prime is 40223789. The next prime is 40223831. The reversal of 40223821 is 12832204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40223821 - 2⁵ = 40223789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40223792 and 40223801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40223831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13000 + ... + 15793.

It is an arithmetic number, because the mean of its divisors is an integer number (5528448).

Almost surely, 2^40223821 is an apocalyptic number.

It is an amenable number.

40223821 is a deficient number, since it is larger than the sum of its proper divisors (4003763).

40223821 is a wasteful number, since it uses less digits than its factorization.

40223821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28931.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 40223821 is about 6342.2252404026. The cubic root of 40223821 is about 342.6318841379.

The spelling of 40223821 in words is "forty million, two hundred twenty-three thousand, eight hundred twenty-one".