7940238451 has 2 divisors, whose sum is σ = 7940238452. Its totient is φ = 7940238450.

The previous prime is 7940238347. The next prime is 7940238479. The reversal of 7940238451 is 1548320497.

It is a strong prime.

It is an emirp because it is prime and its reverse (1548320497) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7940238451 - 2¹⁵ = 7940205683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7940238398 and 7940238407.

It is not a weakly prime, because it can be changed into another prime (7940238751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3970119225 + 3970119226.

It is an arithmetic number, because the mean of its divisors is an integer number (3970119226).

Almost surely, 2^7940238451 is an apocalyptic number.

7940238451 is a deficient number, since it is larger than the sum of its proper divisors (1).

7940238451 is an equidigital number, since it uses as much as digits as its factorization.

7940238451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 7940238451 is about 89108.0156383252. The cubic root of 7940238451 is about 1995.0074183513.

The spelling of 7940238451 in words is "seven billion, nine hundred forty million, two hundred thirty-eight thousand, four hundred fifty-one".