1253405620 has 24 divisors (see below), whose sum is σ = 2668211784. Its totient is φ = 494493696.

The previous prime is 1253405611. The next prime is 1253405689. The reversal of 1253405620 is 265043521.

It can be written as a sum of positive squares in 4 ways, for example, as 190384804 + 1063020816 = 13798^2 + 32604^2 .

It is a congruent number.

It is an unprimeable number.

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, 427789 + ... + 430708.

It is an arithmetic number, because the mean of its divisors is an integer number (111175491).

Almost surely, 2^1253405620 is an apocalyptic number.

1253405620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1253405620 is an abundant number, since it is smaller than the sum of its proper divisors (1414806164).

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

1253405620 is a wasteful number, since it uses less digits than its factorization.

1253405620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858579 (or 858577 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1253405620 is about 35403.4690390645. The cubic root of 1253405620 is about 1078.1947493571.

The spelling of 1253405620 in words is "one billion, two hundred fifty-three million, four hundred five thousand, six hundred twenty".