1225142620 has 24 divisors (see below), whose sum is σ = 2770707744. Its totient is φ = 452360256.

The previous prime is 1225142603. The next prime is 1225142641. The reversal of 1225142620 is 262415221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2355784 + ... + 2356303.

It is an arithmetic number, because the mean of its divisors is an integer number (115446156).

Almost surely, 2^1225142620 is an apocalyptic number.

1225142620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225142620 is an abundant number, since it is smaller than the sum of its proper divisors (1545565124).

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

1225142620 is a wasteful number, since it uses less digits than its factorization.

1225142620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4712109 (or 4712107 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1225142620 is about 35002.0373692732. The cubic root of 1225142620 is about 1070.0290032025.

Adding to 1225142620 its reverse (262415221), we get a palindrome (1487557841).

The spelling of 1225142620 in words is "one billion, two hundred twenty-five million, one hundred forty-two thousand, six hundred twenty".