207981940 has 48 divisors (see below), whose sum is σ = 446471424. Its totient is φ = 81360000.

The previous prime is 207981887. The next prime is 207981941. The reversal of 207981940 is 49189702.

207981940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 207981893 and 207981902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207981941) 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, 276565 + ... + 277315.

It is an arithmetic number, because the mean of its divisors is an integer number (9301488).

Almost surely, 2^207981940 is an apocalyptic number.

207981940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

207981940 is an abundant number, since it is smaller than the sum of its proper divisors (238489484).

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

207981940 is a wasteful number, since it uses less digits than its factorization.

207981940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 207981940 is about 14421.5789704179. The cubic root of 207981940 is about 592.4820648906.

The spelling of 207981940 in words is "two hundred seven million, nine hundred eighty-one thousand, nine hundred forty".