1998593407 has 2 divisors, whose sum is σ = 1998593408. Its totient is φ = 1998593406.

The previous prime is 1998593393. The next prime is 1998593411. The reversal of 1998593407 is 7043958991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1998593407 - 2²⁷ = 1864375679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998593507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999296703 + 999296704.

It is an arithmetic number, because the mean of its divisors is an integer number (999296704).

Almost surely, 2^1998593407 is an apocalyptic number.

1998593407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998593407 is an equidigital number, since it uses as much as digits as its factorization.

1998593407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 1998593407 is about 44705.6305961565. The cubic root of 1998593407 is about 1259.6256146030.

It can be divided in two parts, 1998593 and 407, that added together give a triangular number (1999000 = T₁₉₉₉).

The spelling of 1998593407 in words is "one billion, nine hundred ninety-eight million, five hundred ninety-three thousand, four hundred seven".