1201423520 has 72 divisors (see below), whose sum is σ = 3119903892. Its totient is φ = 436874240.

The previous prime is 1201423501. The next prime is 1201423529. The reversal of 1201423520 is 253241021.

It can be written as a sum of positive squares in 2 ways, for example, as 1180884496 + 20539024 = 34364^2 + 4532^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1201423492 and 1201423501.

It is not an unprimeable number, because it can be changed into a prime (1201423529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11669 + ... + 50388.

Almost surely, 2^1201423520 is an apocalyptic number.

1201423520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201423520 is an abundant number, since it is smaller than the sum of its proper divisors (1918480372).

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

1201423520 is a wasteful number, since it uses less digits than its factorization.

1201423520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62094 (or 62075 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1201423520 is about 34661.5568028904. The cubic root of 1201423520 is about 1063.0786019490.

Adding to 1201423520 its reverse (253241021), we get a palindrome (1454664541).

The spelling of 1201423520 in words is "one billion, two hundred one million, four hundred twenty-three thousand, five hundred twenty".