7806372421 has 2 divisors, whose sum is σ = 7806372422. Its totient is φ = 7806372420.

The previous prime is 7806372403. The next prime is 7806372437. The reversal of 7806372421 is 1242736087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6482504196 + 1323868225 = 80514^2 + 36385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7806372421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7806372451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3903186210 + 3903186211.

It is an arithmetic number, because the mean of its divisors is an integer number (3903186211).

Almost surely, 2^7806372421 is an apocalyptic number.

It is an amenable number.

7806372421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7806372421 is an equidigital number, since it uses as much as digits as its factorization.

7806372421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 7806372421 is about 88353.6780275728. The cubic root of 7806372421 is about 1983.7324099203.

The spelling of 7806372421 in words is "seven billion, eight hundred six million, three hundred seventy-two thousand, four hundred twenty-one".