1245723640 has 64 divisors (see below), whose sum is σ = 3257625600. Its totient is φ = 419860608.

The previous prime is 1245723629. The next prime is 1245723643. The reversal of 1245723640 is 463275421.

It is a junction number, because it is equal to n+sod(n) for n = 1245723596 and 1245723605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245723643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21184 + ... + 54223.

It is an arithmetic number, because the mean of its divisors is an integer number (50900400).

Almost surely, 2^1245723640 is an apocalyptic number.

1245723640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245723640 is an abundant number, since it is smaller than the sum of its proper divisors (2011901960).

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

1245723640 is a wasteful number, since it uses less digits than its factorization.

1245723640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75484 (or 75480 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 1245723640 is about 35294.8103833977. The cubic root of 1245723640 is about 1075.9875230607.

The spelling of 1245723640 in words is "one billion, two hundred forty-five million, seven hundred twenty-three thousand, six hundred forty".