1245156642 has 24 divisors (see below), whose sum is σ = 2698493616. Its totient is φ = 414951576.

The previous prime is 1245156637. The next prime is 1245156667. The reversal of 1245156642 is 2466515421.

1245156642 is a `hidden beast` number, since 1 + 2 + 4 + 5 + 1 + 5 + 6 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1245156597 and 1245156606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126793 + ... + 136259.

It is an arithmetic number, because the mean of its divisors is an integer number (112437234).

Almost surely, 2^1245156642 is an apocalyptic number.

1245156642 is an abundant number, since it is smaller than the sum of its proper divisors (1453336974).

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

1245156642 is a wasteful number, since it uses less digits than its factorization.

1245156642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16782 (or 16779 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 1245156642 is about 35286.7771551894. Note that the first 3 decimals coincide. The cubic root of 1245156642 is about 1075.8242510641.

The spelling of 1245156642 in words is "one billion, two hundred forty-five million, one hundred fifty-six thousand, six hundred forty-two".