209757142 has 24 divisors (see below), whose sum is σ = 367373664. Its totient is φ = 89559792.

The previous prime is 209757133. The next prime is 209757157. The reversal of 209757142 is 241757902.

209757142 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23283 + ... + 31009.

It is an arithmetic number, because the mean of its divisors is an integer number (15307236).

Almost surely, 2^209757142 is an apocalyptic number.

209757142 is a deficient number, since it is larger than the sum of its proper divisors (157616522).

209757142 is a wasteful number, since it uses less digits than its factorization.

209757142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8020 (or 8013 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 209757142 is about 14482.9949250837. The cubic root of 209757142 is about 594.1629753049.

The spelling of 209757142 in words is "two hundred nine million, seven hundred fifty-seven thousand, one hundred forty-two".