6540390237 has 4 divisors (see below), whose sum is σ = 8720520320. Its totient is φ = 4360260156.

The previous prime is 6540390221. The next prime is 6540390253. The reversal of 6540390237 is 7320930456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (6540390221) and next prime (6540390253).

It is not a de Polignac number, because 6540390237 - 2⁴ = 6540390221 is a prime.

It is a super-3 number, since 3×6540390237³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6540390195 and 6540390204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540390287) 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, 1090065037 + ... + 1090065042.

It is an arithmetic number, because the mean of its divisors is an integer number (2180130080).

Almost surely, 2^6540390237 is an apocalyptic number.

It is an amenable number.

6540390237 is a deficient number, since it is larger than the sum of its proper divisors (2180130083).

6540390237 is a wasteful number, since it uses less digits than its factorization.

6540390237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180130082.

The product of its (nonzero) digits is 136080, while the sum is 39.

The square root of 6540390237 is about 80872.6791753556. The cubic root of 6540390237 is about 1870.1131635789.

The spelling of 6540390237 in words is "six billion, five hundred forty million, three hundred ninety thousand, two hundred thirty-seven".