1253642730 has 64 divisors (see below), whose sum is σ = 3189870720. Its totient is φ = 314230784.

The previous prime is 1253642699. The next prime is 1253642771. The reversal of 1253642730 is 372463521.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1253642691 and 1253642700.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 656437 + ... + 658343.

It is an arithmetic number, because the mean of its divisors is an integer number (49841730).

Almost surely, 2^1253642730 is an apocalyptic number.

1253642730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1253642730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1594935360).

1253642730 is an abundant number, since it is smaller than the sum of its proper divisors (1936227990).

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

1253642730 is a wasteful number, since it uses less digits than its factorization.

1253642730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 1253642730 is about 35406.8175638534. The cubic root of 1253642730 is about 1078.2627333717.

The spelling of 1253642730 in words is "one billion, two hundred fifty-three million, six hundred forty-two thousand, seven hundred thirty".