30145923 has 12 divisors (see below), whose sum is σ = 44366400. Its totient is φ = 19717776.

The previous prime is 30145909. The next prime is 30145933. The reversal of 30145923 is 32954103.

It is a de Polignac number, because none of the positive numbers 2^k-30145923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30145933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31123 + ... + 32076.

It is an arithmetic number, because the mean of its divisors is an integer number (3697200).

Almost surely, 2^30145923 is an apocalyptic number.

30145923 is a deficient number, since it is larger than the sum of its proper divisors (14220477).

30145923 is a wasteful number, since it uses less digits than its factorization.

30145923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63258 (or 63255 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 30145923 is about 5490.5303022568. The cubic root of 30145923 is about 311.2262322781.

The spelling of 30145923 in words is "thirty million, one hundred forty-five thousand, nine hundred twenty-three".