1420140440 has 32 divisors (see below), whose sum is σ = 3305502000. Its totient is φ = 548467584.

The previous prime is 1420140439. The next prime is 1420140461. The reversal of 1420140440 is 440410241.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 610970 + ... + 613289.

Almost surely, 2^1420140440 is an apocalyptic number.

1420140440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1420140440 is an abundant number, since it is smaller than the sum of its proper divisors (1885361560).

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

1420140440 is a wasteful number, since it uses less digits than its factorization.

1420140440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224299 (or 1224295 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1420140440 is about 37684.7507620788. The cubic root of 1420140440 is about 1124.0279181526.

Adding to 1420140440 its reverse (440410241), we get a palindrome (1860550681).

The spelling of 1420140440 in words is "one billion, four hundred twenty million, one hundred forty thousand, four hundred forty".