40366421 has 4 divisors (see below), whose sum is σ = 40758432. Its totient is φ = 39974412.

The previous prime is 40366369. The next prime is 40366429. The reversal of 40366421 is 12466304.

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 40366421 - 2¹⁰ = 40365397 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 (40366429) 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, 195851 + ... + 196056.

It is an arithmetic number, because the mean of its divisors is an integer number (10189608).

Almost surely, 2^40366421 is an apocalyptic number.

It is an amenable number.

40366421 is a deficient number, since it is larger than the sum of its proper divisors (392011).

40366421 is a wasteful number, since it uses less digits than its factorization.

40366421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392010.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 40366421 is about 6353.4574052243. The cubic root of 40366421 is about 343.0363018921.

The spelling of 40366421 in words is "forty million, three hundred sixty-six thousand, four hundred twenty-one".