1245821740 has 24 divisors (see below), whose sum is σ = 2636831232. Its totient is φ = 494403840.

The previous prime is 1245821737. The next prime is 1245821741. The reversal of 1245821740 is 471285421.

It is a junction number, because it is equal to n+sod(n) for n = 1245821696 and 1245821705.

It is not an unprimeable number, because it can be changed into a prime (1245821741) 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, 242701 + ... + 247780.

It is an arithmetic number, because the mean of its divisors is an integer number (109867968).

Almost surely, 2^1245821740 is an apocalyptic number.

1245821740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245821740 is an abundant number, since it is smaller than the sum of its proper divisors (1391009492).

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

1245821740 is a wasteful number, since it uses less digits than its factorization.

1245821740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490617 (or 490615 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 1245821740 is about 35296.2000787620. The cubic root of 1245821740 is about 1076.0157667797.

The spelling of 1245821740 in words is "one billion, two hundred forty-five million, eight hundred twenty-one thousand, seven hundred forty".