28397942 has 8 divisors (see below), whose sum is σ = 43075800. Its totient is φ = 14039344.

The previous prime is 28397933. The next prime is 28397947. The reversal of 28397942 is 24979382.

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

It is a junction number, because it is equal to n+sod(n) for n = 28397893 and 28397902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28397947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79592 + ... + 79947.

It is an arithmetic number, because the mean of its divisors is an integer number (5384475).

Almost surely, 2^28397942 is an apocalyptic number.

28397942 is a deficient number, since it is larger than the sum of its proper divisors (14677858).

28397942 is a wasteful number, since it uses less digits than its factorization.

28397942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159630.

The product of its digits is 217728, while the sum is 44.

The square root of 28397942 is about 5328.9719458822. The cubic root of 28397942 is about 305.0906905799.

The spelling of 28397942 in words is "twenty-eight million, three hundred ninety-seven thousand, nine hundred forty-two".