1309900998 has 64 divisors (see below), whose sum is σ = 3089737728. Its totient is φ = 362465280.

The previous prime is 1309900997. The next prime is 1309901009. The reversal of 1309900998 is 8990099031.

It is a super-2 number, since 2×1309900998² = 3431681249122792008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309900997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188058 + ... + 194898.

It is an arithmetic number, because the mean of its divisors is an integer number (48277152).

Almost surely, 2^1309900998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309900998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544868864).

1309900998 is an abundant number, since it is smaller than the sum of its proper divisors (1779836730).

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

1309900998 is a wasteful number, since it uses less digits than its factorization.

1309900998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6997.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 1309900998 is about 36192.5544553020. The cubic root of 1309900998 is about 1094.1566166940.

The spelling of 1309900998 in words is "one billion, three hundred nine million, nine hundred thousand, nine hundred ninety-eight".