2400009909 has 16 divisors (see below), whose sum is σ = 3674657280. Its totient is φ = 1377995760.

The previous prime is 2400009889. The next prime is 2400009917. The reversal of 2400009909 is 9099000042.

It is a happy number.

It is not a de Polignac number, because 2400009909 - 2⁹ = 2400009397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 2400009909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2400009959) 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, 1913257 + ... + 1914510.

It is an arithmetic number, because the mean of its divisors is an integer number (229666080).

Almost surely, 2^2400009909 is an apocalyptic number.

It is an amenable number.

2400009909 is a deficient number, since it is larger than the sum of its proper divisors (1274647371).

2400009909 is a wasteful number, since it uses less digits than its factorization.

2400009909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3827800.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 2400009909 is about 48989.8959888669. The cubic root of 2400009909 is about 1338.8677427760.

The spelling of 2400009909 in words is "two billion, four hundred million, nine thousand, nine hundred nine".