1420440240 has 40 divisors (see below), whose sum is σ = 4403365488. Its totient is φ = 378784000.

The previous prime is 1420440221. The next prime is 1420440257. The reversal of 1420440240 is 420440241.

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

It is a super-2 number, since 2×1420440240² = 4035300950822515200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2959011 + ... + 2959490.

Almost surely, 2^1420440240 is an apocalyptic number.

1420440240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1420440240 is an abundant number, since it is smaller than the sum of its proper divisors (2982925248).

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

1420440240 is a wasteful number, since it uses less digits than its factorization.

1420440240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5918517 (or 5918511 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 1420440240 is about 37688.7282884419. The cubic root of 1420440240 is about 1124.1070088890.

Adding to 1420440240 its reverse (420440241), we get a palindrome (1840880481).

Subtracting from 1420440240 its reverse (420440241), we obtain a palindrome (999999999).

The spelling of 1420440240 in words is "one billion, four hundred twenty million, four hundred forty thousand, two hundred forty".