40705731 has 18 divisors (see below), whose sum is σ = 64630020. Its totient is φ = 24669480.

The previous prime is 40705711. The next prime is 40705787. The reversal of 40705731 is 13750704.

It is not a de Polignac number, because 40705731 - 2¹³ = 40697539 is a prime.

It is a super-2 number, since 2×40705731² = 3313913072488722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40705695 and 40705704.

It is not an unprimeable number, because it can be changed into a prime (40705711) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17601 + ... + 19778.

Almost surely, 2^40705731 is an apocalyptic number.

40705731 is a deficient number, since it is larger than the sum of its proper divisors (23924289).

40705731 is a wasteful number, since it uses less digits than its factorization.

40705731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37407 (or 37393 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 40705731 is about 6380.1043094921. The cubic root of 40705731 is about 343.9947803201.

It can be divided in two parts, 4070 and 5731, that added together give a square (9801 = 99²).

The spelling of 40705731 in words is "forty million, seven hundred five thousand, seven hundred thirty-one".