40354921 has 4 divisors (see below), whose sum is σ = 41746500. Its totient is φ = 38963344.

The previous prime is 40354907. The next prime is 40354927. The reversal of 40354921 is 12945304.

40354921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28355625 + 11999296 = 5325^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 40354921 - 2⁷ = 40354793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40354921.

It is not an unprimeable number, because it can be changed into a prime (40354927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695746 + ... + 695803.

It is an arithmetic number, because the mean of its divisors is an integer number (10436625).

Almost surely, 2^40354921 is an apocalyptic number.

It is an amenable number.

40354921 is a deficient number, since it is larger than the sum of its proper divisors (1391579).

40354921 is a wasteful number, since it uses less digits than its factorization.

40354921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391578.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 40354921 is about 6352.5523217050. The cubic root of 40354921 is about 343.0037228982.

The spelling of 40354921 in words is "forty million, three hundred fifty-four thousand, nine hundred twenty-one".