1253797820 has 24 divisors (see below), whose sum is σ = 2872337328. Its totient is φ = 455926400.

The previous prime is 1253797817. The next prime is 1253797841. The reversal of 1253797820 is 287973521.

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 2849321 + ... + 2849760.

It is an arithmetic number, because the mean of its divisors is an integer number (119680722).

Almost surely, 2^1253797820 is an apocalyptic number.

1253797820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1253797820 is an abundant number, since it is smaller than the sum of its proper divisors (1618539508).

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

1253797820 is a wasteful number, since it uses less digits than its factorization.

1253797820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699101 (or 5699099 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 1253797820 is about 35409.0076110585. The cubic root of 1253797820 is about 1078.3071960318.

The spelling of 1253797820 in words is "one billion, two hundred fifty-three million, seven hundred ninety-seven thousand, eight hundred twenty".