2015638 has 4 divisors (see below), whose sum is σ = 3023460. Its totient is φ = 1007818.

The previous prime is 2015633. The next prime is 2015669. The reversal of 2015638 is 8365102.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015633) 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 as a sum of consecutive naturals, namely, 503908 + ... + 503911.

It is an arithmetic number, because the mean of its divisors is an integer number (755865).

2^2015638 is an apocalyptic number.

2015638 is a deficient number, since it is larger than the sum of its proper divisors (1007822).

2015638 is a wasteful number, since it uses less digits than its factorization.

2015638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007821.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2015638 is about 1419.7316647874. The cubic root of 2015638 is about 126.3196302499.

The spelling of 2015638 in words is "two million, fifteen thousand, six hundred thirty-eight".