1421756240 has 40 divisors (see below), whose sum is σ = 3500032680. Its totient is φ = 535248896.

The previous prime is 1421756239. The next prime is 1421756279. The reversal of 1421756240 is 426571241.

It can be written as a sum of positive squares in 4 ways, for example, as 116812864 + 1304943376 = 10808^2 + 36124^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1421756197 and 1421756206.

It is a congruent number.

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, 521345 + ... + 524064.

It is an arithmetic number, because the mean of its divisors is an integer number (87500817).

Almost surely, 2^1421756240 is an apocalyptic number.

1421756240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421756240 is an abundant number, since it is smaller than the sum of its proper divisors (2078276440).

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

1421756240 is a wasteful number, since it uses less digits than its factorization.

1421756240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045439 (or 1045433 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 1421756240 is about 37706.1830473465. The cubic root of 1421756240 is about 1124.4540534567.

The spelling of 1421756240 in words is "one billion, four hundred twenty-one million, seven hundred fifty-six thousand, two hundred forty".