408172042 has 16 divisors (see below), whose sum is σ = 642297600. Its totient is φ = 194271280.

The previous prime is 408172021. The next prime is 408172043. The reversal of 408172042 is 240271804.

It is a self number, because there is not a number n which added to its sum of digits gives 408172042.

It is not an unprimeable number, because it can be changed into a prime (408172043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45442 + ... + 53677.

It is an arithmetic number, because the mean of its divisors is an integer number (40143600).

Almost surely, 2^408172042 is an apocalyptic number.

408172042 is a deficient number, since it is larger than the sum of its proper divisors (234125558).

408172042 is a wasteful number, since it uses less digits than its factorization.

408172042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99221.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 408172042 is about 20203.2681019681. The cubic root of 408172042 is about 741.7901884969.

The spelling of 408172042 in words is "four hundred eight million, one hundred seventy-two thousand, forty-two".