1340121420 has 72 divisors (see below), whose sum is σ = 4434590160. Its totient is φ = 324877440.

The previous prime is 1340121401. The next prime is 1340121421. The reversal of 1340121420 is 241210431.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1340121393 and 1340121402.

It is not an unprimeable number, because it can be changed into a prime (1340121421) 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, 336435 + ... + 340394.

It is an arithmetic number, because the mean of its divisors is an integer number (61591530).

Almost surely, 2^1340121420 is an apocalyptic number.

1340121420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1340121420 is an abundant number, since it is smaller than the sum of its proper divisors (3094468740).

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

1340121420 is a wasteful number, since it uses less digits than its factorization.

1340121420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676855 (or 676850 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1340121420 is about 36607.6688686947. The cubic root of 1340121420 is about 1102.5070695399.

Adding to 1340121420 its reverse (241210431), we get a palindrome (1581331851).

It can be divided in two parts, 1340 and 121420, that added together give a triangular number (122760 = T₄₉₅).

The spelling of 1340121420 in words is "one billion, three hundred forty million, one hundred twenty-one thousand, four hundred twenty".