42400012 has 12 divisors (see below), whose sum is σ = 75307960. Its totient is φ = 20883456.

The previous prime is 42400009. The next prime is 42400067. The reversal of 42400012 is 21000424.

It is a super-2 number, since 2×42400012² = 3595522035200288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42399965 and 42400001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78837 + ... + 79372.

Almost surely, 2^42400012 is an apocalyptic number.

It is an amenable number.

42400012 is a deficient number, since it is larger than the sum of its proper divisors (32907948).

42400012 is a wasteful number, since it uses less digits than its factorization.

42400012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158280 (or 158278 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 42400012 is about 6511.5291598825. The cubic root of 42400012 is about 348.7027131495.

Adding to 42400012 its reverse (21000424), we get a palindrome (63400436).

The spelling of 42400012 in words is "forty-two million, four hundred thousand, twelve".