1247357140 has 24 divisors (see below), whose sum is σ = 2620245600. Its totient is φ = 498791328.

The previous prime is 1247357129. The next prime is 1247357141. The reversal of 1247357140 is 417537421.

It is a junction number, because it is equal to n+sod(n) for n = 1247357096 and 1247357105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247357141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77511 + ... + 92209.

It is an arithmetic number, because the mean of its divisors is an integer number (109176900).

Almost surely, 2^1247357140 is an apocalyptic number.

1247357140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247357140 is an abundant number, since it is smaller than the sum of its proper divisors (1372888460).

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

1247357140 is a wasteful number, since it uses less digits than its factorization.

1247357140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18951 (or 18949 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 1247357140 is about 35317.9435981202. The cubic root of 1247357140 is about 1076.4576267744.

The spelling of 1247357140 in words is "one billion, two hundred forty-seven million, three hundred fifty-seven thousand, one hundred forty".