9400042 has 4 divisors (see below), whose sum is σ = 14100066. Its totient is φ = 4700020.

The previous prime is 9400021. The next prime is 9400043. The reversal of 9400042 is 2400049.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2400049 = 769 ⋅3121.

It can be written as a sum of positive squares in only one way, i.e., 7789681 + 1610361 = 2791^2 + 1269^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9399992 and 9400019.

It is not an unprimeable number, because it can be changed into a prime (9400043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2350009 + ... + 2350012.

Almost surely, 2^9400042 is an apocalyptic number.

9400042 is a deficient number, since it is larger than the sum of its proper divisors (4700024).

9400042 is a wasteful number, since it uses less digits than its factorization.

9400042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4700023.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 9400042 is about 3065.9487927883. The cubic root of 9400042 is about 211.0457437715.

The spelling of 9400042 in words is "nine million, four hundred thousand, forty-two".