209527139492 has 36 divisors (see below), whose sum is σ = 406210344960. Its totient is φ = 94489662960.

The previous prime is 209527139447. The next prime is 209527139543. The reversal of 209527139492 is 294931725902.

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, 1642892 + ... + 1765827.

Almost surely, 2^209527139492 is an apocalyptic number.

209527139492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

209527139492 is a deficient number, since it is larger than the sum of its proper divisors (196683205468).

209527139492 is a wasteful number, since it uses less digits than its factorization.

209527139492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408872 (or 3408859 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 209527139492 in words is "two hundred nine billion, five hundred twenty-seven million, one hundred thirty-nine thousand, four hundred ninety-two".