10400042 has 4 divisors (see below), whose sum is σ = 15600066. Its totient is φ = 5200020.

The previous prime is 10400029. The next prime is 10400057. The reversal of 10400042 is 24000401.

10400042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24000401 = 19 ⋅1263179.

It can be written as a sum of positive squares in only one way, i.e., 8814961 + 1585081 = 2969^2 + 1259^2 .

It is a junction number, because it is equal to n+sod(n) for n = 10399996 and 10400032.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2600009 + ... + 2600012.

Almost surely, 2^10400042 is an apocalyptic number.

10400042 is a deficient number, since it is larger than the sum of its proper divisors (5200024).

10400042 is an equidigital number, since it uses as much as digits as its factorization.

10400042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200023.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 10400042 is about 3224.9096111364. The cubic root of 10400042 is about 218.2788704484.

Adding to 10400042 its reverse (24000401), we get a palindrome (34400443).

The spelling of 10400042 in words is "ten million, four hundred thousand, forty-two".