825403987 has 4 divisors (see below), whose sum is σ = 825462000. Its totient is φ = 825345976.

The previous prime is 825403979. The next prime is 825403991. The reversal of 825403987 is 789304528.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 825403987 - 2³ = 825403979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (825403087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8514 + ... + 41512.

It is an arithmetic number, because the mean of its divisors is an integer number (206365500).

Almost surely, 2^825403987 is an apocalyptic number.

825403987 is a deficient number, since it is larger than the sum of its proper divisors (58013).

825403987 is a wasteful number, since it uses less digits than its factorization.

825403987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58012.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 825403987 is about 28729.8448829784. The cubic root of 825403987 is about 938.0417915317.

The spelling of 825403987 in words is "eight hundred twenty-five million, four hundred three thousand, nine hundred eighty-seven".