40706513 has 4 divisors (see below), whose sum is σ = 40748340. Its totient is φ = 40664688.

The previous prime is 40706461. The next prime is 40706557. The reversal of 40706513 is 31560704.

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 38837824 + 1868689 = 6232^2 + 1367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40706513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40706593) 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, 19418 + ... + 21411.

It is an arithmetic number, because the mean of its divisors is an integer number (10187085).

Almost surely, 2^40706513 is an apocalyptic number.

It is an amenable number.

40706513 is a deficient number, since it is larger than the sum of its proper divisors (41827).

40706513 is an equidigital number, since it uses as much as digits as its factorization.

40706513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41826.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 40706513 is about 6380.1655934623. The cubic root of 40706513 is about 343.9969831401.

The spelling of 40706513 in words is "forty million, seven hundred six thousand, five hundred thirteen".