1225440342 has 144 divisors (see below), whose sum is σ = 3274663392. Its totient is φ = 324311040.

The previous prime is 1225440341. The next prime is 1225440343. The reversal of 1225440342 is 2430445221.

1225440342 is a `hidden beast` number, since 1 + 2 + 254 + 403 + 4 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1225440341) and next prime (1225440343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225440341) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2657992 + ... + 2658452.

It is an arithmetic number, because the mean of its divisors is an integer number (22740718).

Almost surely, 2^1225440342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225440342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1637331696).

1225440342 is an abundant number, since it is smaller than the sum of its proper divisors (2049223050).

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

1225440342 is a wasteful number, since it uses less digits than its factorization.

1225440342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 1225440342 is about 35006.2900347923. The cubic root of 1225440342 is about 1070.1156721252.

Adding to 1225440342 its reverse (2430445221), we get a palindrome (3655885563).

The spelling of 1225440342 in words is "one billion, two hundred twenty-five million, four hundred forty thousand, three hundred forty-two".