1253645142 has 16 divisors (see below), whose sum is σ = 2512782192. Its totient is φ = 416966400.

The previous prime is 1253645101. The next prime is 1253645143. The reversal of 1253645142 is 2415463521.

It is a super-2 number, since 2×1253645142² = 3143252284120400328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253645143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225859 + ... + 231342.

It is an arithmetic number, because the mean of its divisors is an integer number (157048887).

Almost surely, 2^1253645142 is an apocalyptic number.

1253645142 is an abundant number, since it is smaller than the sum of its proper divisors (1259137050).

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

1253645142 is a wasteful number, since it uses less digits than its factorization.

1253645142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457663.

The product of its digits is 28800, while the sum is 33.

The square root of 1253645142 is about 35406.8516250739. The cubic root of 1253645142 is about 1078.2634248946.

The spelling of 1253645142 in words is "one billion, two hundred fifty-three million, six hundred forty-five thousand, one hundred forty-two".