1200661920 has 192 divisors, whose sum is σ = 4218480000. Its totient is φ = 318947328.

The previous prime is 1200661919. The next prime is 1200661949. The reversal of 1200661920 is 291660021.

1200661920 is a `hidden beast` number, since 1 + 20 + 0 + 6 + 619 + 20 = 666.

It is a super-2 number, since 2×1200661920² = 2883178092276172800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1939371 + ... + 1939989.

It is an arithmetic number, because the mean of its divisors is an integer number (21971250).

Almost surely, 2^1200661920 is an apocalyptic number.

1200661920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200661920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2109240000).

1200661920 is an abundant number, since it is smaller than the sum of its proper divisors (3017818080).

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

1200661920 is a wasteful number, since it uses less digits than its factorization.

1200661920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1200661920 is about 34650.5688264998. The cubic root of 1200661920 is about 1062.8539207573.

The spelling of 1200661920 in words is "one billion, two hundred million, six hundred sixty-one thousand, nine hundred twenty".