215994000 has 80 divisors (see below), whose sum is σ = 696384000. Its totient is φ = 57596800.

The previous prime is 215993983. The next prime is 215994007. The reversal of 215994000 is 499512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is not an unprimeable number, because it can be changed into a prime (215994007) 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, 12000 + ... + 23999.

It is an arithmetic number, because the mean of its divisors is an integer number (8704800).

Almost surely, 2^215994000 is an apocalyptic number.

215994000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

215994000 is the 12000-th pentagonal number.

It is an amenable number.

215994000 is an abundant number, since it is smaller than the sum of its proper divisors (480390000).

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

215994000 is a wasteful number, since it uses less digits than its factorization.

215994000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36025 (or 36009 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 215994000 is about 14696.7343311363. The cubic root of 215994000 is about 599.9944443930.

The spelling of 215994000 in words is "two hundred fifteen million, nine hundred ninety-four thousand".