40247685 has 20 divisors (see below), whose sum is σ = 72148428. Its totient is φ = 21465216.

The previous prime is 40247671. The next prime is 40247693. The reversal of 40247685 is 58674204.

It can be written as a sum of positive squares in 2 ways, for example, as 5602689 + 34644996 = 2367^2 + 5886^2 .

It is not a de Polignac number, because 40247685 - 2⁸ = 40247429 is a prime.

It is a super-2 number, since 2×40247685² = 3239752295718450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49284 + ... + 50093.

Almost surely, 2^40247685 is an apocalyptic number.

40247685 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40247685 is a deficient number, since it is larger than the sum of its proper divisors (31900743).

40247685 is an equidigital number, since it uses as much as digits as its factorization.

40247685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99394 (or 99385 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 40247685 is about 6344.1063200422. The cubic root of 40247685 is about 342.6996296563.

The spelling of 40247685 in words is "forty million, two hundred forty-seven thousand, six hundred eighty-five".