1420036640 has 144 divisors (see below), whose sum is σ = 3779599320. Its totient is φ = 503500800.

The previous prime is 1420036619. The next prime is 1420036643. The reversal of 1420036640 is 466300241.

It can be written as a sum of positive squares in 4 ways, for example, as 1127079184 + 292957456 = 33572^2 + 17116^2 .

It is not an unprimeable number, because it can be changed into a prime (1420036643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 792866 + ... + 794654.

Almost surely, 2^1420036640 is an apocalyptic number.

1420036640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1420036640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1889799660).

1420036640 is an abundant number, since it is smaller than the sum of its proper divisors (2359562680).

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

1420036640 is a wasteful number, since it uses less digits than its factorization.

1420036640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867 (or 1848 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1420036640 is about 37683.3735220190. The cubic root of 1420036640 is about 1124.0005319079. Note that the first 3 decimals are identical.

Adding to 1420036640 its reverse (466300241), we get a palindrome (1886336881).

The spelling of 1420036640 in words is "one billion, four hundred twenty million, thirty-six thousand, six hundred forty".