1200639872 has 16 divisors (see below), whose sum is σ = 2391900000. Its totient is φ = 600319872.

The previous prime is 1200639809. The next prime is 1200639893. The reversal of 1200639872 is 2789360021.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×1200639872² = 2883072204472352768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4689872 + ... + 4690127.

It is an arithmetic number, because the mean of its divisors is an integer number (149493750).

Almost surely, 2^1200639872 is an apocalyptic number.

It is an amenable number.

1200639872 is a deficient number, since it is larger than the sum of its proper divisors (1191260128).

1200639872 is an frugal number, since it uses more digits than its factorization.

1200639872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9380013 (or 9380001 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1200639872 is about 34650.2506773039. The cubic root of 1200639872 is about 1062.8474149163.

Adding to 1200639872 its reverse (2789360021), we get a palindrome (3989999893).

The spelling of 1200639872 in words is "one billion, two hundred million, six hundred thirty-nine thousand, eight hundred seventy-two".