812042040 has 32 divisors (see below), whose sum is σ = 2436126480. Its totient is φ = 216544512.

The previous prime is 812042017. The next prime is 812042041. The reversal of 812042040 is 40240218.

It is a junction number, because it is equal to n+sod(n) for n = 812041998 and 812042016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812042041) 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, 3383389 + ... + 3383628.

Almost surely, 2^812042040 is an apocalyptic number.

It is an amenable number.

812042040 is an abundant number, since it is smaller than the sum of its proper divisors (1624084440).

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

812042040 is a wasteful number, since it uses less digits than its factorization.

812042040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6767031 (or 6767027 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 812042040 is about 28496.3513453916. The cubic root of 812042040 is about 932.9524392492.

Adding to 812042040 its reverse (40240218), we get a palindrome (852282258).

The spelling of 812042040 in words is "eight hundred twelve million, forty-two thousand, forty".