40049009 has 16 divisors (see below), whose sum is σ = 53773440. Its totient is φ = 28805760.

The previous prime is 40048997. The next prime is 40049027. The reversal of 40049009 is 90094004.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40049009 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

40049009 is a modest number, since divided by 9009 gives 4004 as remainder.

It is not an unprimeable number, because it can be changed into a prime (40049089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19004 + ... + 21005.

It is an arithmetic number, because the mean of its divisors is an integer number (3360840).

Almost surely, 2^40049009 is an apocalyptic number.

It is an amenable number.

40049009 is a deficient number, since it is larger than the sum of its proper divisors (13724431).

40049009 is a wasteful number, since it uses less digits than its factorization.

40049009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40040.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 40049009 is about 6328.4286359254. The cubic root of 40049009 is about 342.1348060155.

It can be divided in two parts, 4004 and 9009, that multiplied together give a square (36072036 = 6006²).

The spelling of 40049009 in words is "forty million, forty-nine thousand, nine".