2309640540 has 24 divisors (see below), whose sum is σ = 6466993680. Its totient is φ = 615904128.

The previous prime is 2309640539. The next prime is 2309640547. The reversal of 2309640540 is 450469032.

It is a super-2 number, since 2×2309640540² = 10668878848022983200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2309640547) 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, 19246945 + ... + 19247064.

It is an arithmetic number, because the mean of its divisors is an integer number (269458070).

Almost surely, 2^2309640540 is an apocalyptic number.

2309640540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2309640540 is an abundant number, since it is smaller than the sum of its proper divisors (4157353140).

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

2309640540 is a wasteful number, since it uses less digits than its factorization.

2309640540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38494021 (or 38494019 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 2309640540 is about 48058.7197082902. The cubic root of 2309640540 is about 1321.8478367516.

It can be divided in two parts, 23096 and 40540, that added together give a palindrome (63636).

The spelling of 2309640540 in words is "two billion, three hundred nine million, six hundred forty thousand, five hundred forty".