209742988 has 24 divisors (see below), whose sum is σ = 451754912. Its totient is φ = 82975104.

The previous prime is 209742983. The next prime is 209742997. The reversal of 209742988 is 889247902.

It is not an unprimeable number, because it can be changed into a prime (209742983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287745 + ... + 288472.

Almost surely, 2^209742988 is an apocalyptic number.

209742988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209742988 is an abundant number, since it is smaller than the sum of its proper divisors (242011924).

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

209742988 is a wasteful number, since it uses less digits than its factorization.

209742988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576241 (or 576239 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 209742988 is about 14482.5062748131. The cubic root of 209742988 is about 594.1496106874.

The spelling of 209742988 in words is "two hundred nine million, seven hundred forty-two thousand, nine hundred eighty-eight".