402042506 has 4 divisors (see below), whose sum is σ = 603063762. Its totient is φ = 201021252.

The previous prime is 402042497. The next prime is 402042523. The reversal of 402042506 is 605240204.

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., 397803025 + 4239481 = 19945^2 + 2059^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510625 + ... + 100510628.

Almost surely, 2^402042506 is an apocalyptic number.

402042506 is a deficient number, since it is larger than the sum of its proper divisors (201021256).

402042506 is a wasteful number, since it uses less digits than its factorization.

402042506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201021255.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 402042506 is about 20050.9976310407. The cubic root of 402042506 is about 738.0582805647.

The spelling of 402042506 in words is "four hundred two million, forty-two thousand, five hundred six".