406400042 has 8 divisors (see below), whose sum is σ = 609877632. Its totient is φ = 203107500.

The previous prime is 406400003. The next prime is 406400047. The reversal of 406400042 is 240004604.

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 = 406399987 and 406400023.

It is not an unprimeable number, because it can be changed into a prime (406400047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40634 + ... + 49637.

It is an arithmetic number, because the mean of its divisors is an integer number (76234704).

Almost surely, 2^406400042 is an apocalyptic number.

406400042 is a deficient number, since it is larger than the sum of its proper divisors (203477590).

406400042 is a wasteful number, since it uses less digits than its factorization.

406400042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92524.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 406400042 is about 20159.3661110661. The cubic root of 406400042 is about 740.7151851272.

Adding to 406400042 its reverse (240004604), we get a palindrome (646404646).

The spelling of 406400042 in words is "four hundred six million, four hundred thousand, forty-two".