146239993 has 2 divisors, whose sum is σ = 146239994. Its totient is φ = 146239992.

The previous prime is 146239991. The next prime is 146239999. The reversal of 146239993 is 399932641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137077264 + 9162729 = 11708^2 + 3027^2 .

It is a cyclic number.

It is not a de Polignac number, because 146239993 - 2¹ = 146239991 is a prime.

It is a super-2 number, since 2×146239993² = 42772271105280098, which contains 22 as substring.

Together with 146239991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (146239991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73119996 + 73119997.

It is an arithmetic number, because the mean of its divisors is an integer number (73119997).

Almost surely, 2^146239993 is an apocalyptic number.

It is an amenable number.

146239993 is a deficient number, since it is larger than the sum of its proper divisors (1).

146239993 is an equidigital number, since it uses as much as digits as its factorization.

146239993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 46.

The square root of 146239993 is about 12092.9728768405. The cubic root of 146239993 is about 526.8521045359.

The spelling of 146239993 in words is "one hundred forty-six million, two hundred thirty-nine thousand, nine hundred ninety-three".