157798447 has 2 divisors, whose sum is σ = 157798448. Its totient is φ = 157798446.

The previous prime is 157798409. The next prime is 157798453. The reversal of 157798447 is 744897751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157798447 - 2¹⁵ = 157765679 is a prime.

It is a super-2 number, since 2×157798447² = 49800699751223618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 157798394 and 157798403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157798457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78899223 + 78899224.

It is an arithmetic number, because the mean of its divisors is an integer number (78899224).

Almost surely, 2^157798447 is an apocalyptic number.

157798447 is a deficient number, since it is larger than the sum of its proper divisors (1).

157798447 is an equidigital number, since it uses as much as digits as its factorization.

157798447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1975680, while the sum is 52.

The square root of 157798447 is about 12561.7851836433. The cubic root of 157798447 is about 540.3820421755.

The spelling of 157798447 in words is "one hundred fifty-seven million, seven hundred ninety-eight thousand, four hundred forty-seven".