215290540 has 24 divisors (see below), whose sum is σ = 453665520. Its totient is φ = 85819968.

The previous prime is 215290513. The next prime is 215290553. The reversal of 215290540 is 45092512.

It is a super-2 number, since 2×215290540² = 92700033226983200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215290499 and 215290508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12510 + ... + 24229.

It is an arithmetic number, because the mean of its divisors is an integer number (18902730).

Almost surely, 2^215290540 is an apocalyptic number.

215290540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215290540 is an abundant number, since it is smaller than the sum of its proper divisors (238374980).

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

215290540 is a wasteful number, since it uses less digits than its factorization.

215290540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37041 (or 37039 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 215290540 is about 14672.7822855790. The cubic root of 215290540 is about 599.3423720651.

The spelling of 215290540 in words is "two hundred fifteen million, two hundred ninety thousand, five hundred forty".