215402838 has 16 divisors (see below), whose sum is σ = 492349440. Its totient is φ = 61543656.

The previous prime is 215402827. The next prime is 215402881. The reversal of 215402838 is 838204512.

It is a junction number, because it is equal to n+sod(n) for n = 215402799 and 215402808.

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, 2564278 + ... + 2564361.

It is an arithmetic number, because the mean of its divisors is an integer number (30771840).

Almost surely, 2^215402838 is an apocalyptic number.

215402838 is an abundant number, since it is smaller than the sum of its proper divisors (276946602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215402838 is a wasteful number, since it uses less digits than its factorization.

215402838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5128651.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 215402838 is about 14676.6085319463. The cubic root of 215402838 is about 599.4465618896.

The spelling of 215402838 in words is "two hundred fifteen million, four hundred two thousand, eight hundred thirty-eight".