215842440 has 64 divisors (see below), whose sum is σ = 706397760. Its totient is φ = 52325120.

The previous prime is 215842427. The next prime is 215842453. The reversal of 215842440 is 44248512.

It is an interprime number because it is at equal distance from previous prime (215842427) and next prime (215842453).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 215842398 and 215842407.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80439 + ... + 83078.

It is an arithmetic number, because the mean of its divisors is an integer number (11037465).

Almost surely, 2^215842440 is an apocalyptic number.

215842440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215842440 is an abundant number, since it is smaller than the sum of its proper divisors (490555320).

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

215842440 is a wasteful number, since it uses less digits than its factorization.

215842440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163542 (or 163538 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 30.

The square root of 215842440 is about 14691.5771787783. The cubic root of 215842440 is about 599.8540756241.

The spelling of 215842440 in words is "two hundred fifteen million, eight hundred forty-two thousand, four hundred forty".