211478840 has 16 divisors (see below), whose sum is σ = 475827480. Its totient is φ = 84591520.

The previous prime is 211478837. The next prime is 211478849. The reversal of 211478840 is 48874112.

211478840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 211478840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211478849) 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, 2643446 + ... + 2643525.

Almost surely, 2^211478840 is an apocalyptic number.

211478840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211478840 is an abundant number, since it is smaller than the sum of its proper divisors (264348640).

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

211478840 is a wasteful number, since it uses less digits than its factorization.

211478840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286982 (or 5286978 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 211478840 is about 14542.3120582664. The cubic root of 211478840 is about 595.7841883385.

The spelling of 211478840 in words is "two hundred eleven million, four hundred seventy-eight thousand, eight hundred forty".