1427320440 has 640 divisors, whose sum is σ = 6088642560. Its totient is φ = 291879936.

The previous prime is 1427320439. The next prime is 1427320471. The reversal of 1427320440 is 440237241.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 13857429 + ... + 13857531.

It is an arithmetic number, because the mean of its divisors is an integer number (9513504).

Almost surely, 2^1427320440 is an apocalyptic number.

1427320440 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 1427320440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3044321280).

1427320440 is an abundant number, since it is smaller than the sum of its proper divisors (4661322120).

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

1427320440 is a wasteful number, since it uses less digits than its factorization.

1427320440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 1427320440 is about 37779.8946531088. The cubic root of 1427320440 is about 1125.9190356830.

Adding to 1427320440 its reverse (440237241), we get a palindrome (1867557681).

The spelling of 1427320440 in words is "one billion, four hundred twenty-seven million, three hundred twenty thousand, four hundred forty".