7538998909 has 8 divisors (see below), whose sum is σ = 8166965240. Its totient is φ = 6959073888.

The previous prime is 7538998877. The next prime is 7538998913. The reversal of 7538998909 is 9098998357.

It can be written as a sum of positive squares in 4 ways, for example, as 2639698884 + 4899300025 = 51378^2 + 69995^2 .

It is not a de Polignac number, because 7538998909 - 2⁵ = 7538998877 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 (7538998919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1713552 + ... + 1717945.

It is an arithmetic number, because the mean of its divisors is an integer number (1020870655).

Almost surely, 2^7538998909 is an apocalyptic number.

It is an amenable number.

7538998909 is a deficient number, since it is larger than the sum of its proper divisors (627966331).

7538998909 is an equidigital number, since it uses as much as digits as its factorization.

7538998909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431536 (or 3431510 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 67.

The square root of 7538998909 is about 86827.4087428618. The cubic root of 7538998909 is about 1960.8207472170.

The spelling of 7538998909 in words is "seven billion, five hundred thirty-eight million, nine hundred ninety-eight thousand, nine hundred nine".