840699087 has 4 divisors (see below), whose sum is σ = 1120932120. Its totient is φ = 560466056.

The previous prime is 840699077. The next prime is 840699103. The reversal of 840699087 is 780996048.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 840699087 - 2⁷ = 840698959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840699007) 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, 140116512 + ... + 140116517.

It is an arithmetic number, because the mean of its divisors is an integer number (280233030).

Almost surely, 2^840699087 is an apocalyptic number.

840699087 is a deficient number, since it is larger than the sum of its proper divisors (280233033).

840699087 is a wasteful number, since it uses less digits than its factorization.

840699087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280233032.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 840699087 is about 28994.8113806591. The cubic root of 840699087 is about 943.8004757471.

The spelling of 840699087 in words is "eight hundred forty million, six hundred ninety-nine thousand, eighty-seven".