1247785990 has 16 divisors (see below), whose sum is σ = 2450198160. Its totient is φ = 453740320.

The previous prime is 1247785969. The next prime is 1247786093. The reversal of 1247785990 is 995877421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5671645 + ... + 5671864.

It is an arithmetic number, because the mean of its divisors is an integer number (153137385).

Almost surely, 2^1247785990 is an apocalyptic number.

1247785990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1247785990 is a deficient number, since it is larger than the sum of its proper divisors (1202412170).

1247785990 is a wasteful number, since it uses less digits than its factorization.

1247785990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11343527.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The square root of 1247785990 is about 35324.0143528450. The cubic root of 1247785990 is about 1076.5809771616.

The spelling of 1247785990 in words is "one billion, two hundred forty-seven million, seven hundred eighty-five thousand, nine hundred ninety".