1223620545 has 16 divisors (see below), whose sum is σ = 2237477760. Its totient is φ = 559369344.

The previous prime is 1223620537. The next prime is 1223620547. The reversal of 1223620545 is 5450263221.

It is not a de Polignac number, because 1223620545 - 2³ = 1223620537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1223620547) 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, 5826660 + ... + 5826869.

It is an arithmetic number, because the mean of its divisors is an integer number (139842360).

Almost surely, 2^1223620545 is an apocalyptic number.

1223620545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223620545 is a deficient number, since it is larger than the sum of its proper divisors (1013857215).

1223620545 is a wasteful number, since it uses less digits than its factorization.

1223620545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11653544.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 1223620545 is about 34980.2879490721. The cubic root of 1223620545 is about 1069.5856971744.

Adding to 1223620545 its reverse (5450263221), we get a palindrome (6673883766).

The spelling of 1223620545 in words is "one billion, two hundred twenty-three million, six hundred twenty thousand, five hundred forty-five".