40247731 has 8 divisors (see below), whose sum is σ = 40694400. Its totient is φ = 39803712.

The previous prime is 40247717. The next prime is 40247759. The reversal of 40247731 is 13774204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40247731 - 2⁹ = 40247219 is a prime.

It is a super-2 number, since 2×40247731² = 3239759701296722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40247731.

It is not an unprimeable number, because it can be changed into a prime (40242731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46206 + ... + 47068.

It is an arithmetic number, because the mean of its divisors is an integer number (5086800).

Almost surely, 2^40247731 is an apocalyptic number.

40247731 is a deficient number, since it is larger than the sum of its proper divisors (446669).

40247731 is a wasteful number, since it uses less digits than its factorization.

40247731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 40247731 is about 6344.1099454533. The cubic root of 40247731 is about 342.6997602160.

The spelling of 40247731 in words is "forty million, two hundred forty-seven thousand, seven hundred thirty-one".