30391642 has 4 divisors (see below), whose sum is σ = 45587466. Its totient is φ = 15195820.

The previous prime is 30391633. The next prime is 30391643. The reversal of 30391642 is 24619303.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24619303 = 347 ⋅70949.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 10491121 = 4461^2 + 3239^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30391642.

It is not an unprimeable number, because it can be changed into a prime (30391643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7597909 + ... + 7597912.

Almost surely, 2^30391642 is an apocalyptic number.

30391642 is a deficient number, since it is larger than the sum of its proper divisors (15195824).

30391642 is a wasteful number, since it uses less digits than its factorization.

30391642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15195823.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 30391642 is about 5512.8615074206. The cubic root of 30391642 is about 312.0695453671.

The spelling of 30391642 in words is "thirty million, three hundred ninety-one thousand, six hundred forty-two".