402109042 has 4 divisors (see below), whose sum is σ = 603163566. Its totient is φ = 201054520.

The previous prime is 402109003. The next prime is 402109063. The reversal of 402109042 is 240901204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 334194961 + 67914081 = 18281^2 + 8241^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100527259 + ... + 100527262.

Almost surely, 2^402109042 is an apocalyptic number.

402109042 is a deficient number, since it is larger than the sum of its proper divisors (201054524).

402109042 is a wasteful number, since it uses less digits than its factorization.

402109042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201054523.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 402109042 is about 20052.6567317151. The cubic root of 402109042 is about 738.0989932889.

The spelling of 402109042 in words is "four hundred two million, one hundred nine thousand, forty-two".