402615 has 24 divisors (see below), whose sum is σ = 730080. Its totient is φ = 204864.

The previous prime is 402613. The next prime is 402631. The reversal of 402615 is 516204.

It is a happy number.

It is not a de Polignac number, because 402615 - 2¹ = 402613 is a prime.

It is an Ulam number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 841 + ... + 1229.

It is an arithmetic number, because the mean of its divisors is an integer number (30420).

2⁴⁰²⁶¹⁵ is an apocalyptic number.

402615 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

402615 is a deficient number, since it is larger than the sum of its proper divisors (327465).

402615 is a wasteful number, since it uses less digits than its factorization.

402615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 402615 is about 634.5195032464. The cubic root of 402615 is about 73.8408437187.

Adding to 402615 its reverse (516204), we get a palindrome (918819).

The spelling of 402615 in words is "four hundred two thousand, six hundred fifteen".