1998243970 has 16 divisors (see below), whose sum is σ = 3680487360. Its totient is φ = 780709104.

The previous prime is 1998243959. The next prime is 1998243997. The reversal of 1998243970 is 793428991.

It is a happy 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, 2323110 + ... + 2323969.

It is an arithmetic number, because the mean of its divisors is an integer number (230030460).

Almost surely, 2^1998243970 is an apocalyptic number.

1998243970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998243970 is a deficient number, since it is larger than the sum of its proper divisors (1682243390).

1998243970 is a wasteful number, since it uses less digits than its factorization.

1998243970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647129.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 1998243970 is about 44701.7222263304. The cubic root of 1998243970 is about 1259.5521987280.

The spelling of 1998243970 in words is "one billion, nine hundred ninety-eight million, two hundred forty-three thousand, nine hundred seventy".