1915399998 has 24 divisors (see below), whose sum is σ = 4246547448. Its totient is φ = 623618352.

The previous prime is 1915399991. The next prime is 1915400027. The reversal of 1915399998 is 8999935191.

1915399998 is a `hidden beast` number, since 1 + 9 + 1 + 539 + 9 + 9 + 98 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1915399991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1236565 + ... + 1238112.

It is an arithmetic number, because the mean of its divisors is an integer number (176939477).

Almost surely, 2^1915399998 is an apocalyptic number.

1915399998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1915399998 is an abundant number, since it is smaller than the sum of its proper divisors (2331147450).

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

1915399998 is a wasteful number, since it uses less digits than its factorization.

1915399998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474728 (or 2474725 counting only the distinct ones).

The product of its digits is 7085880, while the sum is 63.

The square root of 1915399998 is about 43765.2830220484. The cubic root of 1915399998 is about 1241.8996200390.

The spelling of 1915399998 in words is "one billion, nine hundred fifteen million, three hundred ninety-nine thousand, nine hundred ninety-eight".