40049864 has 8 divisors (see below), whose sum is σ = 75093510. Its totient is φ = 20024928.

The previous prime is 40049857. The next prime is 40049869. The reversal of 40049864 is 46894004.

It can be written as a sum of positive squares in only one way, i.e., 35880100 + 4169764 = 5990^2 + 2042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (40049869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2503109 + ... + 2503124.

Almost surely, 2^40049864 is an apocalyptic number.

It is an amenable number.

40049864 is a deficient number, since it is larger than the sum of its proper divisors (35043646).

40049864 is a wasteful number, since it uses less digits than its factorization.

40049864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5006239 (or 5006235 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 40049864 is about 6328.4961878791. The cubic root of 40049864 is about 342.1372407256.

The spelling of 40049864 in words is "forty million, forty-nine thousand, eight hundred sixty-four".