1999235136 has 56 divisors (see below), whose sum is σ = 5460292864. Its totient is φ = 644912640.

The previous prime is 1999235131. The next prime is 1999235191. The reversal of 1999235136 is 6315329991.

It is a super-2 number, since 2×1999235136² = 7993882258033876992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1999235131) 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, 161995 + ... + 173898.

Almost surely, 2^1999235136 is an apocalyptic number.

1999235136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1999235136 is an abundant number, since it is smaller than the sum of its proper divisors (3461057728).

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

1999235136 is a wasteful number, since it uses less digits than its factorization.

1999235136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335939 (or 335929 counting only the distinct ones).

The product of its digits is 393660, while the sum is 48.

The square root of 1999235136 is about 44712.8072927657. The cubic root of 1999235136 is about 1259.7604180406.

The spelling of 1999235136 in words is "one billion, nine hundred ninety-nine million, two hundred thirty-five thousand, one hundred thirty-six".