99942257 has 4 divisors (see below), whose sum is σ = 102068736. Its totient is φ = 97815780.

The previous prime is 99942253. The next prime is 99942281. The reversal of 99942257 is 75224999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75224999 = 463 ⋅162473.

It is a cyclic number.

It is not a de Polignac number, because 99942257 - 2² = 99942253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 2126431 = 99942257 / (9 + 9 + 9 + 4 + 2 + 2 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99942253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063169 + ... + 1063262.

It is an arithmetic number, because the mean of its divisors is an integer number (25517184).

Almost surely, 2^99942257 is an apocalyptic number.

It is an amenable number.

99942257 is a deficient number, since it is larger than the sum of its proper divisors (2126479).

99942257 is a wasteful number, since it uses less digits than its factorization.

99942257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126478.

The product of its digits is 408240, while the sum is 47.

The square root of 99942257 is about 9997.1124330979. The cubic root of 99942257 is about 464.0695264053.

The spelling of 99942257 in words is "ninety-nine million, nine hundred forty-two thousand, two hundred fifty-seven".