402440015 has 8 divisors (see below), whose sum is σ = 483040800. Its totient is φ = 321876832.

The previous prime is 402439951. The next prime is 402440023. The reversal of 402440015 is 510044204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402440015 - 2⁶ = 402439951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26897 + ... + 39093.

It is an arithmetic number, because the mean of its divisors is an integer number (60380100).

Almost surely, 2^402440015 is an apocalyptic number.

402440015 is a deficient number, since it is larger than the sum of its proper divisors (80600785).

402440015 is a wasteful number, since it uses less digits than its factorization.

402440015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18801.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 402440015 is about 20060.9076315106. The cubic root of 402440015 is about 738.3014457074.

Adding to 402440015 its reverse (510044204), we get a palindrome (912484219).

The spelling of 402440015 in words is "four hundred two million, four hundred forty thousand, fifteen".