208390740 has 48 divisors (see below), whose sum is σ = 584566080. Its totient is φ = 55468800.

The previous prime is 208390717. The next prime is 208390747. The reversal of 208390740 is 47093802.

208390740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208390747) 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, 33171 + ... + 38949.

It is an arithmetic number, because the mean of its divisors is an integer number (12178460).

Almost surely, 2^208390740 is an apocalyptic number.

208390740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208390740 is an abundant number, since it is smaller than the sum of its proper divisors (376175340).

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

208390740 is a wasteful number, since it uses less digits than its factorization.

208390740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6392 (or 6390 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 208390740 is about 14435.7452180343. The cubic root of 208390740 is about 592.8699962513.

The spelling of 208390740 in words is "two hundred eight million, three hundred ninety thousand, seven hundred forty".