1253775640 has 32 divisors (see below), whose sum is σ = 3037996080. Its totient is φ = 462932352.

The previous prime is 1253775617. The next prime is 1253775683. The reversal of 1253775640 is 465773521.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1253775593 and 1253775602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1205034 + ... + 1206073.

Almost surely, 2^1253775640 is an apocalyptic number.

1253775640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1253775640 is an abundant number, since it is smaller than the sum of its proper divisors (1784220440).

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

1253775640 is a wasteful number, since it uses less digits than its factorization.

1253775640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411131 (or 2411127 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 1253775640 is about 35408.6944125309. The cubic root of 1253775640 is about 1078.3008374855.

The spelling of 1253775640 in words is "one billion, two hundred fifty-three million, seven hundred seventy-five thousand, six hundred forty".