40505953 has 4 divisors (see below), whose sum is σ = 41902740. Its totient is φ = 39109168.

The previous prime is 40505911. The next prime is 40505981. The reversal of 40505953 is 35950504.

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 24127744 + 16378209 = 4912^2 + 4047^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40505953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40505903) 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, 698350 + ... + 698407.

It is an arithmetic number, because the mean of its divisors is an integer number (10475685).

Almost surely, 2^40505953 is an apocalyptic number.

It is an amenable number.

40505953 is a deficient number, since it is larger than the sum of its proper divisors (1396787).

40505953 is a wasteful number, since it uses less digits than its factorization.

40505953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396786.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 40505953 is about 6364.4287253453. The cubic root of 40505953 is about 343.4310978278.

The spelling of 40505953 in words is "forty million, five hundred five thousand, nine hundred fifty-three".