1999997782 has 8 divisors (see below), whose sum is σ = 3004551000. Its totient is φ = 998480784.

The previous prime is 1999997777. The next prime is 1999997807. The reversal of 1999997782 is 2877999991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1999997782² = 7999982256009839048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757407 + ... + 760042.

It is an arithmetic number, because the mean of its divisors is an integer number (375568875).

Almost surely, 2^1999997782 is an apocalyptic number.

1999997782 is a deficient number, since it is larger than the sum of its proper divisors (1004553218).

1999997782 is a wasteful number, since it uses less digits than its factorization.

1999997782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518110.

The product of its digits is 46294416, while the sum is 70.

The square root of 1999997782 is about 44721.3347519950. The cubic root of 1999997782 is about 1259.9205841439.

The spelling of 1999997782 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred eighty-two".