208442740 has 48 divisors (see below), whose sum is σ = 484102080. Its totient is φ = 74753280.

The previous prime is 208442737. The next prime is 208442743. The reversal of 208442740 is 47244802.

208442740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (208442737) and next prime (208442743).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208442743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9571 + ... + 22549.

It is an arithmetic number, because the mean of its divisors is an integer number (10085460).

Almost surely, 2^208442740 is an apocalyptic number.

208442740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208442740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242051040).

208442740 is an abundant number, since it is smaller than the sum of its proper divisors (275659340).

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

208442740 is a wasteful number, since it uses less digits than its factorization.

208442740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13072 (or 13070 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 208442740 is about 14437.5461904023. The cubic root of 208442740 is about 592.9193053455.

The spelling of 208442740 in words is "two hundred eight million, four hundred forty-two thousand, seven hundred forty".