215839105440 has 192 divisors, whose sum is σ = 795091562496. Its totient is φ = 48187302912.

The previous prime is 215839105409. The next prime is 215839105477. The reversal of 215839105440 is 44501938512.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 215839105392 and 215839105401.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 602472 + ... + 891431.

It is an arithmetic number, because the mean of its divisors is an integer number (4141101888).

Almost surely, 2^215839105440 is an apocalyptic number.

215839105440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215839105440 is an abundant number, since it is smaller than the sum of its proper divisors (579252457056).

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

215839105440 is a wasteful number, since it uses less digits than its factorization.

215839105440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493971 (or 1493963 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 215839105440 in words is "two hundred fifteen billion, eight hundred thirty-nine million, one hundred five thousand, four hundred forty".