40681519 has 4 divisors (see below), whose sum is σ = 42084360. Its totient is φ = 39278680.

The previous prime is 40681499. The next prime is 40681559. The reversal of 40681519 is 91518604.

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 40681519 - 2¹⁹ = 40157231 is a prime.

It is a super-2 number, since 2×40681519² = 3309971976294722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40681559) 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, 701377 + ... + 701434.

It is an arithmetic number, because the mean of its divisors is an integer number (10521090).

Almost surely, 2^40681519 is an apocalyptic number.

40681519 is a deficient number, since it is larger than the sum of its proper divisors (1402841).

40681519 is a wasteful number, since it uses less digits than its factorization.

40681519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402840.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 40681519 is about 6378.2065661125. The cubic root of 40681519 is about 343.9265634433.

The spelling of 40681519 in words is "forty million, six hundred eighty-one thousand, five hundred nineteen".