40681539 has 6 divisors (see below), whose sum is σ = 58762236. Its totient is φ = 27121020.

The previous prime is 40681499. The next prime is 40681559. The reversal of 40681539 is 93518604.

40681539 is a `hidden beast` number, since 40 + 6 + 81 + 539 = 666.

It is not a de Polignac number, because 40681539 - 2⁸ = 40681283 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 2260077 + ... + 2260094.

It is an arithmetic number, because the mean of its divisors is an integer number (9793706).

Almost surely, 2^40681539 is an apocalyptic number.

40681539 is a deficient number, since it is larger than the sum of its proper divisors (18080697).

40681539 is a wasteful number, since it uses less digits than its factorization.

40681539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4520177 (or 4520174 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 40681539 is about 6378.2081339511. The cubic root of 40681539 is about 343.9266198042.

The spelling of 40681539 in words is "forty million, six hundred eighty-one thousand, five hundred thirty-nine".