40905047 has 4 divisors (see below), whose sum is σ = 41110800. Its totient is φ = 40699296.

The previous prime is 40905037. The next prime is 40905061. The reversal of 40905047 is 74050904.

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 40905047 - 2⁸ = 40904791 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 (40905037) 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, 102578 + ... + 102975.

It is an arithmetic number, because the mean of its divisors is an integer number (10277700).

Almost surely, 2^40905047 is an apocalyptic number.

40905047 is a deficient number, since it is larger than the sum of its proper divisors (205753).

40905047 is a wasteful number, since it uses less digits than its factorization.

40905047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205752.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 40905047 is about 6395.7053559400. The cubic root of 40905047 is about 344.5553243176. Note that the first 3 decimals are identical.

It can be divided in two parts, 4090504 and 7, that multiplied together give a triangular number (28633528 = T₇₅₆₇).

The spelling of 40905047 in words is "forty million, nine hundred five thousand, forty-seven".