40043730 has 32 divisors (see below), whose sum is σ = 96816384. Its totient is φ = 10599296.

The previous prime is 40043701. The next prime is 40043741. The reversal of 40043730 is 3734004.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40043697 and 40043706.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 762 + ... + 8981.

It is an arithmetic number, because the mean of its divisors is an integer number (3025512).

Almost surely, 2^40043730 is an apocalyptic number.

40043730 is an abundant number, since it is smaller than the sum of its proper divisors (56772654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40043730 is a wasteful number, since it uses less digits than its factorization.

40043730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9890.

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 40043730 is about 6328.0115360198. The cubic root of 40043730 is about 342.1197726930.

Adding to 40043730 its reverse (3734004), we get a palindrome (43777734).

The spelling of 40043730 in words is "forty million, forty-three thousand, seven hundred thirty".