30129948 has 24 divisors (see below), whose sum is σ = 78114960. Its totient is φ = 10043280.

The previous prime is 30129941. The next prime is 30129949. The reversal of 30129948 is 84992103.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30129941) 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, 139383 + ... + 139598.

It is an arithmetic number, because the mean of its divisors is an integer number (3254790).

Almost surely, 2^30129948 is an apocalyptic number.

It is an amenable number.

30129948 is an abundant number, since it is smaller than the sum of its proper divisors (47985012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30129948 is a wasteful number, since it uses less digits than its factorization.

30129948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278994 (or 278986 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 30129948 is about 5489.0753319662. The cubic root of 30129948 is about 311.1712473132.

The spelling of 30129948 in words is "thirty million, one hundred twenty-nine thousand, nine hundred forty-eight".