1081949780 has 24 divisors (see below), whose sum is σ = 2273080320. Its totient is φ = 432592160.

The previous prime is 1081949773. The next prime is 1081949783. The reversal of 1081949780 is 879491801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081949783) 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, 41381 + ... + 62259.

It is an arithmetic number, because the mean of its divisors is an integer number (94711680).

Almost surely, 2^1081949780 is an apocalyptic number.

1081949780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1081949780 is an abundant number, since it is smaller than the sum of its proper divisors (1191130540).

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

1081949780 is a wasteful number, since it uses less digits than its factorization.

1081949780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23479 (or 23477 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 1081949780 is about 32893.0050314653. The cubic root of 1081949780 is about 1026.6026184722.

The spelling of 1081949780 in words is "one billion, eighty-one million, nine hundred forty-nine thousand, seven hundred eighty".