215419820 has 48 divisors (see below), whose sum is σ = 564012288. Its totient is φ = 67143360.

The previous prime is 215419819. The next prime is 215419823. The reversal of 215419820 is 28914512.

It is not an unprimeable number, because it can be changed into a prime (215419823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68402 + ... + 71481.

It is an arithmetic number, because the mean of its divisors is an integer number (11750256).

Almost surely, 2^215419820 is an apocalyptic number.

215419820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215419820 is an abundant number, since it is smaller than the sum of its proper divisors (348592468).

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

215419820 is a wasteful number, since it uses less digits than its factorization.

215419820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139910 (or 139908 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 215419820 is about 14677.1870601965. The cubic root of 215419820 is about 599.4623145976.

The spelling of 215419820 in words is "two hundred fifteen million, four hundred nineteen thousand, eight hundred twenty".