213705989840 has 40 divisors (see below), whose sum is σ = 567847345920. Its totient is φ = 73270624896.

The previous prime is 213705989801. The next prime is 213705989867. The reversal of 213705989840 is 48989507312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (56).

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, 190808360 + ... + 190809479.

It is an arithmetic number, because the mean of its divisors is an integer number (14196183648).

Almost surely, 2^213705989840 is an apocalyptic number.

213705989840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213705989840 is an abundant number, since it is smaller than the sum of its proper divisors (354141356080).

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

213705989840 is a wasteful number, since it uses less digits than its factorization.

213705989840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381617859 (or 381617853 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 56.

The spelling of 213705989840 in words is "two hundred thirteen billion, seven hundred five million, nine hundred eighty-nine thousand, eight hundred forty".