40284921 has 8 divisors (see below), whose sum is σ = 56540320. Its totient is φ = 25443072.

The previous prime is 40284913. The next prime is 40284967. The reversal of 40284921 is 12948204.

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

It is not a de Polignac number, because 40284921 - 2³ = 40284913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40284991) 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, 353320 + ... + 353433.

It is an arithmetic number, because the mean of its divisors is an integer number (7067540).

Almost surely, 2^40284921 is an apocalyptic number.

It is an amenable number.

40284921 is a deficient number, since it is larger than the sum of its proper divisors (16255399).

40284921 is a wasteful number, since it uses less digits than its factorization.

40284921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706775.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 40284921 is about 6347.0403338879. The cubic root of 40284921 is about 342.8052823594.

The spelling of 40284921 in words is "forty million, two hundred eighty-four thousand, nine hundred twenty-one".