1255401020 has 24 divisors (see below), whose sum is σ = 2692436544. Its totient is φ = 491475776.

The previous prime is 1255401001. The next prime is 1255401029. The reversal of 1255401020 is 201045521.

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 = 1255400983 and 1255401001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255401029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666827 + ... + 668706.

It is an arithmetic number, because the mean of its divisors is an integer number (112184856).

Almost surely, 2^1255401020 is an apocalyptic number.

1255401020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255401020 is an abundant number, since it is smaller than the sum of its proper divisors (1437035524).

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

1255401020 is a wasteful number, since it uses less digits than its factorization.

1255401020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335589 (or 1335587 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1255401020 is about 35431.6386863492. The cubic root of 1255401020 is about 1078.7666017826.

Adding to 1255401020 its reverse (201045521), we get a palindrome (1456446541).

The spelling of 1255401020 in words is "one billion, two hundred fifty-five million, four hundred one thousand, twenty".