1425221520 has 160 divisors (see below), whose sum is σ = 4698984960. Its totient is φ = 356106240.

The previous prime is 1425221509. The next prime is 1425221531. The reversal of 1425221520 is 251225241.

It is an interprime number because it is at equal distance from previous prime (1425221509) and next prime (1425221531).

It is a super-2 number, since 2×1425221520² = 4062512762142220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1105036 + ... + 1106324.

It is an arithmetic number, because the mean of its divisors is an integer number (29368656).

Almost surely, 2^1425221520 is an apocalyptic number.

1425221520 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 1425221520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2349492480).

1425221520 is an abundant number, since it is smaller than the sum of its proper divisors (3273763440).

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

1425221520 is a wasteful number, since it uses less digits than its factorization.

1425221520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593 (or 1587 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1425221520 is about 37752.1061664114. The cubic root of 1425221520 is about 1125.3668650428.

Adding to 1425221520 its reverse (251225241), we get a palindrome (1676446761).

The spelling of 1425221520 in words is "one billion, four hundred twenty-five million, two hundred twenty-one thousand, five hundred twenty".