30429978 has 16 divisors (see below), whose sum is σ = 61128480. Its totient is φ = 10098576.

The previous prime is 30429923. The next prime is 30430013. The reversal of 30429978 is 87992403.

It is a super-2 number, since 2×30429978² = 1851967122160968, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9700 + ... + 12447.

It is an arithmetic number, because the mean of its divisors is an integer number (3820530).

Almost surely, 2^30429978 is an apocalyptic number.

30429978 is an abundant number, since it is smaller than the sum of its proper divisors (30698502).

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

30429978 is a wasteful number, since it uses less digits than its factorization.

30429978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22381.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 30429978 is about 5516.3373718437. The cubic root of 30429978 is about 312.2007050169.

The spelling of 30429978 in words is "thirty million, four hundred twenty-nine thousand, nine hundred seventy-eight".