1421779540 has 24 divisors (see below), whose sum is σ = 2986802280. Its totient is φ = 568508928.

The previous prime is 1421779529. The next prime is 1421779543. The reversal of 1421779540 is 459771241.

It can be written as a sum of positive squares in 4 ways, for example, as 9072144 + 1412707396 = 3012^2 + 37586^2 .

It is a super-2 number, since 2×1421779540² = 4042914120725223200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1421779493 and 1421779502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421779543) 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, 53104 + ... + 75256.

It is an arithmetic number, because the mean of its divisors is an integer number (124450095).

Almost surely, 2^1421779540 is an apocalyptic number.

1421779540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421779540 is an abundant number, since it is smaller than the sum of its proper divisors (1565022740).

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

1421779540 is a wasteful number, since it uses less digits than its factorization.

1421779540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25371 (or 25369 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 1421779540 is about 37706.4920139755. The cubic root of 1421779540 is about 1124.4601960090.

The spelling of 1421779540 in words is "one billion, four hundred twenty-one million, seven hundred seventy-nine thousand, five hundred forty".