1207781980 has 24 divisors (see below), whose sum is σ = 2646618912. Its totient is φ = 462107712.

The previous prime is 1207781951. The next prime is 1207781989. The reversal of 1207781980 is 891877021.

It is a happy number.

It is a super-2 number, since 2×1207781980² = 2917474622425440800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1207781989) 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, 1312347 + ... + 1313266.

It is an arithmetic number, because the mean of its divisors is an integer number (110275788).

Almost surely, 2^1207781980 is an apocalyptic number.

1207781980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1207781980 is an abundant number, since it is smaller than the sum of its proper divisors (1438836932).

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

1207781980 is a wasteful number, since it uses less digits than its factorization.

1207781980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625645 (or 2625643 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 1207781980 is about 34753.1578421300. The cubic root of 1207781980 is about 1064.9507291304.

The spelling of 1207781980 in words is "one billion, two hundred seven million, seven hundred eighty-one thousand, nine hundred eighty".