215454140 has 24 divisors (see below), whose sum is σ = 493586352. Its totient is φ = 78346880.

The previous prime is 215454131. The next prime is 215454181. The reversal of 215454140 is 41454512.

215454140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489449 + ... + 489888.

It is an arithmetic number, because the mean of its divisors is an integer number (20566098).

Almost surely, 2^215454140 is an apocalyptic number.

215454140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215454140 is an abundant number, since it is smaller than the sum of its proper divisors (278132212).

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

215454140 is a wasteful number, since it uses less digits than its factorization.

215454140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979357 (or 979355 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 215454140 is about 14678.3561749945. The cubic root of 215454140 is about 599.4941477164.

The spelling of 215454140 in words is "two hundred fifteen million, four hundred fifty-four thousand, one hundred forty".