30640123 has 4 divisors (see below), whose sum is σ = 31352728. Its totient is φ = 29927520.

The previous prime is 30640111. The next prime is 30640151. The reversal of 30640123 is 32104603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32104603 = 599 ⋅53597.

It is a cyclic number.

It is not a de Polignac number, because 30640123 - 2¹⁷ = 30509051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30640123.

It is not an unprimeable number, because it can be changed into a prime (30640523) 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 in 3 ways as a sum of consecutive naturals, for example, 356238 + ... + 356323.

It is an arithmetic number, because the mean of its divisors is an integer number (7838182).

Almost surely, 2^30640123 is an apocalyptic number.

30640123 is a deficient number, since it is larger than the sum of its proper divisors (712605).

30640123 is an equidigital number, since it uses as much as digits as its factorization.

30640123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712604.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 30640123 is about 5535.3521116547. The cubic root of 30640123 is about 312.9177278688.

Adding to 30640123 its reverse (32104603), we get a palindrome (62744726).

The spelling of 30640123 in words is "thirty million, six hundred forty thousand, one hundred twenty-three".