1998520413 has 8 divisors (see below), whose sum is σ = 2756580000. Its totient is φ = 1286403888.

The previous prime is 1998520409. The next prime is 1998520423. The reversal of 1998520413 is 3140258991.

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

It is not a de Polignac number, because 1998520413 - 2² = 1998520409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998520423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11485663 + ... + 11485836.

It is an arithmetic number, because the mean of its divisors is an integer number (344572500).

Almost surely, 2^1998520413 is an apocalyptic number.

It is an amenable number.

1998520413 is a deficient number, since it is larger than the sum of its proper divisors (758059587).

1998520413 is a wasteful number, since it uses less digits than its factorization.

1998520413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22971531.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1998520413 is about 44704.8142038416. The cubic root of 1998520413 is about 1259.6102794459.

The spelling of 1998520413 in words is "one billion, nine hundred ninety-eight million, five hundred twenty thousand, four hundred thirteen".