30139923 has 8 divisors (see below), whose sum is σ = 43839936. Its totient is φ = 18266600.

The previous prime is 30139877. The next prime is 30139933. The reversal of 30139923 is 32993103.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30139923 - 2¹² = 30135827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30139933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456633 + ... + 456698.

It is an arithmetic number, because the mean of its divisors is an integer number (5479992).

Almost surely, 2^30139923 is an apocalyptic number.

30139923 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

30139923 is a deficient number, since it is larger than the sum of its proper divisors (13700013).

30139923 is a wasteful number, since it uses less digits than its factorization.

30139923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913345.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 30139923 is about 5489.9838797578. The cubic root of 30139923 is about 311.2055829264.

The spelling of 30139923 in words is "thirty million, one hundred thirty-nine thousand, nine hundred twenty-three".