157798247 has 2 divisors, whose sum is σ = 157798248. Its totient is φ = 157798246.

The previous prime is 157798243. The next prime is 157798283. The reversal of 157798247 is 742897751.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157798247 - 2² = 157798243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 157798195 and 157798204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157798241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78899123 + 78899124.

It is an arithmetic number, because the mean of its divisors is an integer number (78899124).

Almost surely, 2^157798247 is an apocalyptic number.

157798247 is a deficient number, since it is larger than the sum of its proper divisors (1).

157798247 is an equidigital number, since it uses as much as digits as its factorization.

157798247 is an evil number, because the sum of its binary digits is even.

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

The square root of 157798247 is about 12561.7772229888. Note that the first 3 decimals coincide. The cubic root of 157798247 is about 540.3818138749.

The spelling of 157798247 in words is "one hundred fifty-seven million, seven hundred ninety-eight thousand, two hundred forty-seven".