40043745 has 24 divisors (see below), whose sum is σ = 79325376. Its totient is φ = 18305568.

The previous prime is 40043741. The next prime is 40043747. The reversal of 40043745 is 54734004.

It is not a de Polignac number, because 40043745 - 2² = 40043741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40043741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63247 + ... + 63876.

It is an arithmetic number, because the mean of its divisors is an integer number (3305224).

Almost surely, 2^40043745 is an apocalyptic number.

40043745 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40043745 is a deficient number, since it is larger than the sum of its proper divisors (39281631).

40043745 is a wasteful number, since it uses less digits than its factorization.

40043745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127141 (or 127138 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 40043745 is about 6328.0127212262. The cubic root of 40043745 is about 342.1198154113.

Adding to 40043745 its reverse (54734004), we get a palindrome (94777749).

The spelling of 40043745 in words is "forty million, forty-three thousand, seven hundred forty-five".