1421644340 has 48 divisors (see below), whose sum is σ = 3108261072. Its totient is φ = 545688576.

The previous prime is 1421644339. The next prime is 1421644349. The reversal of 1421644340 is 434461241.

It can be written as a sum of positive squares in 8 ways, for example, as 96393124 + 1325251216 = 9818^2 + 36404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421644349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40862 + ... + 67178.

It is an arithmetic number, because the mean of its divisors is an integer number (64755439).

Almost surely, 2^1421644340 is an apocalyptic number.

1421644340 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 1421644340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1554130536).

1421644340 is an abundant number, since it is smaller than the sum of its proper divisors (1686616732).

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

1421644340 is a wasteful number, since it uses less digits than its factorization.

1421644340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26436 (or 26434 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 1421644340 is about 37704.6991766278. The cubic root of 1421644340 is about 1124.4245524526.

The spelling of 1421644340 in words is "one billion, four hundred twenty-one million, six hundred forty-four thousand, three hundred forty".