40689493 has 4 divisors (see below), whose sum is σ = 43819468. Its totient is φ = 37559520.

The previous prime is 40689491. The next prime is 40689497. The reversal of 40689493 is 39498604.

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 5560164 + 35129329 = 2358^2 + 5927^2 .

It is a cyclic number.

It is not a de Polignac number, because 40689493 - 2¹ = 40689491 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 (40689491) 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, 1564968 + ... + 1564993.

It is an arithmetic number, because the mean of its divisors is an integer number (10954867).

Almost surely, 2^40689493 is an apocalyptic number.

It is an amenable number.

40689493 is a deficient number, since it is larger than the sum of its proper divisors (3129975).

40689493 is a wasteful number, since it uses less digits than its factorization.

40689493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129974.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 40689493 is about 6378.8316328306. The cubic root of 40689493 is about 343.9490330341.

The spelling of 40689493 in words is "forty million, six hundred eighty-nine thousand, four hundred ninety-three".