215401393876 has 24 divisors (see below), whose sum is σ = 402039458856. Its totient is φ = 100625464320.

The previous prime is 215401393817. The next prime is 215401393939. The reversal of 215401393876 is 678393104512.

It can be written as a sum of positive squares in 4 ways, for example, as 141458732100 + 73942661776 = 376110^2 + 271924^2 .

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, 11551515 + ... + 11570146.

It is an arithmetic number, because the mean of its divisors is an integer number (16751644119).

It is a 1-persistent number, because it is pandigital, but 2⋅215401393876 = 430802787752 is not.

Almost surely, 2^215401393876 is an apocalyptic number.

It is an amenable number.

215401393876 is a deficient number, since it is larger than the sum of its proper divisors (186638064980).

215401393876 is a wasteful number, since it uses less digits than its factorization.

215401393876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23121819 (or 23121817 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 215401393876 in words is "two hundred fifteen billion, four hundred one million, three hundred ninety-three thousand, eight hundred seventy-six".