1247021902 has 16 divisors (see below), whose sum is σ = 2172798432. Its totient is φ = 525676320.

The previous prime is 1247021879. The next prime is 1247021921. The reversal of 1247021902 is 2091207421.

It is a congruent number.

It is an unprimeable number.

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, 729253 + ... + 730960.

It is an arithmetic number, because the mean of its divisors is an integer number (135799902).

Almost surely, 2^1247021902 is an apocalyptic number.

1247021902 is a deficient number, since it is larger than the sum of its proper divisors (925776530).

1247021902 is a wasteful number, since it uses less digits than its factorization.

1247021902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460283.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1247021902 is about 35313.1972780716. The cubic root of 1247021902 is about 1076.3611823737.

The spelling of 1247021902 in words is "one billion, two hundred forty-seven million, twenty-one thousand, nine hundred two".