1998631734 has 16 divisors (see below), whose sum is σ = 4360651200. Its totient is φ = 605645960.

The previous prime is 1998631709. The next prime is 1998631751. The reversal of 1998631734 is 4371368991.

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, 15141084 + ... + 15141215.

It is an arithmetic number, because the mean of its divisors is an integer number (272540700).

Almost surely, 2^1998631734 is an apocalyptic number.

1998631734 is an abundant number, since it is smaller than the sum of its proper divisors (2362019466).

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

1998631734 is a wasteful number, since it uses less digits than its factorization.

1998631734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30282315.

The product of its digits is 979776, while the sum is 51.

The square root of 1998631734 is about 44706.0592537522. The cubic root of 1998631734 is about 1259.6336664929.

The spelling of 1998631734 in words is "one billion, nine hundred ninety-eight million, six hundred thirty-one thousand, seven hundred thirty-four".