1197985990 has 16 divisors (see below), whose sum is σ = 2160775440. Its totient is φ = 478216480.

The previous prime is 1197985939. The next prime is 1197986003. The reversal of 1197985990 is 995897911.

It is a happy number.

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, 117085 + ... + 126904.

It is an arithmetic number, because the mean of its divisors is an integer number (135048465).

Almost surely, 2^1197985990 is an apocalyptic number.

1197985990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1197985990 is a deficient number, since it is larger than the sum of its proper divisors (962789450).

1197985990 is a wasteful number, since it uses less digits than its factorization.

1197985990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244487.

The product of its (nonzero) digits is 1837080, while the sum is 58.

The square root of 1197985990 is about 34611.9342135050. The cubic root of 1197985990 is about 1062.0637348953.

It can be divided in two parts, 11979 and 85990, that added together give a square (97969 = 313²).

The spelling of 1197985990 in words is "one billion, one hundred ninety-seven million, nine hundred eighty-five thousand, nine hundred ninety".