1121399990 has 32 divisors (see below), whose sum is σ = 2044514304. Its totient is φ = 442821600.

The previous prime is 1121399989. The next prime is 1121399999. The reversal of 1121399990 is 999931211.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121399999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249947 + ... + 254393.

It is an arithmetic number, because the mean of its divisors is an integer number (63891072).

Almost surely, 2^1121399990 is an apocalyptic number.

1121399990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1121399990 is a deficient number, since it is larger than the sum of its proper divisors (923114314).

1121399990 is a wasteful number, since it uses less digits than its factorization.

1121399990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4772.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 1121399990 is about 33487.3108803917. The cubic root of 1121399990 is about 1038.9313449540.

The spelling of 1121399990 in words is "one billion, one hundred twenty-one million, three hundred ninety-nine thousand, nine hundred ninety".