7875907421 has 2 divisors, whose sum is σ = 7875907422. Its totient is φ = 7875907420.

The previous prime is 7875907409. The next prime is 7875907447. The reversal of 7875907421 is 1247095787.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7488998521 + 386908900 = 86539^2 + 19670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7875907421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7875907421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7875907451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3937953710 + 3937953711.

It is an arithmetic number, because the mean of its divisors is an integer number (3937953711).

Almost surely, 2^7875907421 is an apocalyptic number.

It is an amenable number.

7875907421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7875907421 is an equidigital number, since it uses as much as digits as its factorization.

7875907421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987840, while the sum is 50.

The square root of 7875907421 is about 88746.3093373465. The cubic root of 7875907421 is about 1989.6050175227.

The spelling of 7875907421 in words is "seven billion, eight hundred seventy-five million, nine hundred seven thousand, four hundred twenty-one".