30143905 has 16 divisors (see below), whose sum is σ = 40824000. Its totient is φ = 21165760.

The previous prime is 30143891. The next prime is 30143917. The reversal of 30143905 is 50934103.

It is not a de Polignac number, because 30143905 - 2¹⁷ = 30012833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30143905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7855 + ... + 11044.

It is an arithmetic number, because the mean of its divisors is an integer number (2551500).

Almost surely, 2^30143905 is an apocalyptic number.

It is an amenable number.

30143905 is a deficient number, since it is larger than the sum of its proper divisors (10680095).

30143905 is a wasteful number, since it uses less digits than its factorization.

30143905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18944.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 30143905 is about 5490.3465282257. The cubic root of 30143905 is about 311.2192875186.

The spelling of 30143905 in words is "thirty million, one hundred forty-three thousand, nine hundred five".