7830440387 has 16 divisors (see below), whose sum is σ = 9764950272. Its totient is φ = 6100189920.

The previous prime is 7830440377. The next prime is 7830440389.

7830440387 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-7830440387 is a prime.

It is a super-2 number, since 2×7830440387² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7830440389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407408 + ... + 426194.

It is an arithmetic number, because the mean of its divisors is an integer number (610309392).

Almost surely, 2^7830440387 is an apocalyptic number.

7830440387 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

7830440387 is a deficient number, since it is larger than the sum of its proper divisors (1934509885).

7830440387 is a wasteful number, since it uses less digits than its factorization.

7830440387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24218.

The product of its (nonzero) digits is 451584, while the sum is 44.

The square root of 7830440387 is about 88489.7756071288. The cubic root of 7830440387 is about 1985.7690119119.

The spelling of 7830440387 in words is "seven billion, eight hundred thirty million, four hundred forty thousand, three hundred eighty-seven".