4009394640 has 40 divisors (see below), whose sum is σ = 12429124128. Its totient is φ = 1069171840.

The previous prime is 4009394621. The next prime is 4009394647. The reversal of 4009394640 is 464939004.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4009394647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8352666 + ... + 8353145.

Almost surely, 2^4009394640 is an apocalyptic number.

4009394640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4009394640 is an abundant number, since it is smaller than the sum of its proper divisors (8419729488).

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

4009394640 is a wasteful number, since it uses less digits than its factorization.

4009394640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16705827 (or 16705821 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 4009394640 is about 63319.7807955776. The cubic root of 4009394640 is about 1588.6428354175.

The spelling of 4009394640 in words is "four billion, nine million, three hundred ninety-four thousand, six hundred forty".