49640999 has 4 divisors (see below), whose sum is σ = 50340240. Its totient is φ = 48941760.

The previous prime is 49640971. The next prime is 49641029. The reversal of 49640999 is 99904694.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99904694 = 2 ⋅49952347.

It is a cyclic number.

It is not a de Polignac number, because 49640999 - 2⁸ = 49640743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49640909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349514 + ... + 349655.

It is an arithmetic number, because the mean of its divisors is an integer number (12585060).

Almost surely, 2^49640999 is an apocalyptic number.

49640999 is a deficient number, since it is larger than the sum of its proper divisors (699241).

49640999 is an equidigital number, since it uses as much as digits as its factorization.

49640999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699240.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 49640999 is about 7045.6368768196. The cubic root of 49640999 is about 367.5193171699.

The spelling of 49640999 in words is "forty-nine million, six hundred forty thousand, nine hundred ninety-nine".