840451834 has 4 divisors (see below), whose sum is σ = 1260677754. Its totient is φ = 420225916.

The previous prime is 840451823. The next prime is 840451861. The reversal of 840451834 is 438154048.

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

It can be written as a sum of positive squares in only one way, i.e., 838276209 + 2175625 = 28953^2 + 1475^2 .

It is a junction number, because it is equal to n+sod(n) for n = 840451793 and 840451802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210112957 + ... + 210112960.

Almost surely, 2^840451834 is an apocalyptic number.

840451834 is a deficient number, since it is larger than the sum of its proper divisors (420225920).

840451834 is a wasteful number, since it uses less digits than its factorization.

840451834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420225919.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 840451834 is about 28990.5473214977. The cubic root of 840451834 is about 943.7079414966.

The spelling of 840451834 in words is "eight hundred forty million, four hundred fifty-one thousand, eight hundred thirty-four".