1405809780 has 24 divisors (see below), whose sum is σ = 3936267552. Its totient is φ = 374882592.

The previous prime is 1405809767. The next prime is 1405809799. The reversal of 1405809780 is 879085041.

It is a super-2 number, since 2×1405809780² = 3952602275087296800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11715022 + ... + 11715141.

It is an arithmetic number, because the mean of its divisors is an integer number (164011148).

Almost surely, 2^1405809780 is an apocalyptic number.

1405809780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1405809780 is an abundant number, since it is smaller than the sum of its proper divisors (2530457772).

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

1405809780 is a wasteful number, since it uses less digits than its factorization.

1405809780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23430175 (or 23430173 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 1405809780 is about 37494.1299405654. The cubic root of 1405809780 is about 1120.2342675346.

The spelling of 1405809780 in words is "one billion, four hundred five million, eight hundred nine thousand, seven hundred eighty".