87903993 has 4 divisors (see below), whose sum is σ = 117205328. Its totient is φ = 58602660.

The previous prime is 87903983. The next prime is 87904009. The reversal of 87903993 is 39930978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87903993 - 2⁶ = 87903929 is a prime.

It is a super-2 number, since 2×87903993² = 15454223970688098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87903983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14650663 + ... + 14650668.

It is an arithmetic number, because the mean of its divisors is an integer number (29301332).

Almost surely, 2^87903993 is an apocalyptic number.

It is an amenable number.

87903993 is a deficient number, since it is larger than the sum of its proper divisors (29301335).

87903993 is a wasteful number, since it uses less digits than its factorization.

87903993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29301334.

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 87903993 is about 9375.7129328921. The cubic root of 87903993 is about 444.6342034532.

The spelling of 87903993 in words is "eighty-seven million, nine hundred three thousand, nine hundred ninety-three".