1368991590 has 32 divisors (see below), whose sum is σ = 3347575776. Its totient is φ = 358176000.

The previous prime is 1368991549. The next prime is 1368991619. The reversal of 1368991590 is 951998631.

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 15 ways as a sum of consecutive naturals, for example, 428911 + ... + 432090.

It is an arithmetic number, because the mean of its divisors is an integer number (104611743).

Almost surely, 2^1368991590 is an apocalyptic number.

1368991590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1368991590 is an abundant number, since it is smaller than the sum of its proper divisors (1978584186).

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

1368991590 is a wasteful number, since it uses less digits than its factorization.

1368991590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861064.

The product of its (nonzero) digits is 524880, while the sum is 51.

The square root of 1368991590 is about 36999.8863511768. The cubic root of 1368991590 is about 1110.3679731229.

The spelling of 1368991590 in words is "one billion, three hundred sixty-eight million, nine hundred ninety-one thousand, five hundred ninety".