1421767780 has 24 divisors (see below), whose sum is σ = 2986562880. Its totient is φ = 568545120.

The previous prime is 1421767751. The next prime is 1421767799. The reversal of 1421767780 is 877671241.

It is a super-2 number, since 2×1421767780² = 4042847240492256800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82515 + ... + 98245.

It is an arithmetic number, because the mean of its divisors is an integer number (124440120).

Almost surely, 2^1421767780 is an apocalyptic number.

1421767780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421767780 is an abundant number, since it is smaller than the sum of its proper divisors (1564795100).

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

1421767780 is a wasteful number, since it uses less digits than its factorization.

1421767780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20259 (or 20257 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 43.

The square root of 1421767780 is about 37706.3360723367. The cubic root of 1421767780 is about 1124.4570957420.

The spelling of 1421767780 in words is "one billion, four hundred twenty-one million, seven hundred sixty-seven thousand, seven hundred eighty".