215693980 has 12 divisors (see below), whose sum is σ = 452957400. Its totient is φ = 86277584.

The previous prime is 215693969. The next prime is 215693981. The reversal of 215693980 is 89396512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215693981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5392330 + ... + 5392369.

It is an arithmetic number, because the mean of its divisors is an integer number (37746450).

Almost surely, 2^215693980 is an apocalyptic number.

215693980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215693980 is an abundant number, since it is smaller than the sum of its proper divisors (237263420).

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

215693980 is a wasteful number, since it uses less digits than its factorization.

215693980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10784708 (or 10784706 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 215693980 is about 14686.5237547896. The cubic root of 215693980 is about 599.7165142289.

The spelling of 215693980 in words is "two hundred fifteen million, six hundred ninety-three thousand, nine hundred eighty".