1255020400 has 30 divisors (see below), whose sum is σ = 3015187472. Its totient is φ = 502008000.

The previous prime is 1255020313. The next prime is 1255020401. The reversal of 1255020400 is 40205521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255020401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1568376 + ... + 1569175.

Almost surely, 2^1255020400 is an apocalyptic number.

1255020400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255020400 is an abundant number, since it is smaller than the sum of its proper divisors (1760167072).

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

1255020400 is a wasteful number, since it uses less digits than its factorization.

1255020400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137569 (or 3137558 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 1255020400 is about 35426.2670909595. The cubic root of 1255020400 is about 1078.6575684564.

Adding to 1255020400 its reverse (40205521), we get a palindrome (1295225921).

The spelling of 1255020400 in words is "one billion, two hundred fifty-five million, twenty thousand, four hundred".