1242725640 has 64 divisors (see below), whose sum is σ = 4014964800. Its totient is φ = 305901312.

The previous prime is 1242725639. The next prime is 1242725651. The reversal of 1242725640 is 465272421.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396750 + ... + 399869.

It is an arithmetic number, because the mean of its divisors is an integer number (62733825).

Almost surely, 2^1242725640 is an apocalyptic number.

1242725640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242725640 is an abundant number, since it is smaller than the sum of its proper divisors (2772239160).

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

1242725640 is a wasteful number, since it uses less digits than its factorization.

1242725640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796646 (or 796642 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 1242725640 is about 35252.3139666037. The cubic root of 1242725640 is about 1075.1236605536.

The spelling of 1242725640 in words is "one billion, two hundred forty-two million, seven hundred twenty-five thousand, six hundred forty".