99942457 has 2 divisors, whose sum is σ = 99942458. Its totient is φ = 99942456.

The previous prime is 99942421. The next prime is 99942463. The reversal of 99942457 is 75424999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95570176 + 4372281 = 9776^2 + 2091^2 .

It is a cyclic number.

It is not a de Polignac number, because 99942457 - 2¹⁹ = 99418169 is a prime.

It is a super-2 number, since 2×99942457² = 19976989422393698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99942457.

It is not a weakly prime, because it can be changed into another prime (99942407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49971228 + 49971229.

It is an arithmetic number, because the mean of its divisors is an integer number (49971229).

Almost surely, 2^99942457 is an apocalyptic number.

It is an amenable number.

99942457 is a deficient number, since it is larger than the sum of its proper divisors (1).

99942457 is an equidigital number, since it uses as much as digits as its factorization.

99942457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 99942457 is about 9997.1224359813. The cubic root of 99942457 is about 464.0698359635.

The spelling of 99942457 in words is "ninety-nine million, nine hundred forty-two thousand, four hundred fifty-seven".