814691972 has 12 divisors (see below), whose sum is σ = 1445241756. Its totient is φ = 401765760.

The previous prime is 814691971. The next prime is 814691981. The reversal of 814691972 is 279196418.

It can be written as a sum of positive squares in 2 ways, for example, as 508231936 + 306460036 = 22544^2 + 17506^2 .

It is not an unprimeable number, because it can be changed into a prime (814691971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394729 + ... + 1395312.

It is an arithmetic number, because the mean of its divisors is an integer number (120436813).

Almost surely, 2^814691972 is an apocalyptic number.

It is an amenable number.

814691972 is a deficient number, since it is larger than the sum of its proper divisors (630549784).

814691972 is a wasteful number, since it uses less digits than its factorization.

814691972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790118 (or 2790116 counting only the distinct ones).

The product of its digits is 217728, while the sum is 47.

The square root of 814691972 is about 28542.8094622796. The cubic root of 814691972 is about 933.9661700778.

The spelling of 814691972 in words is "eight hundred fourteen million, six hundred ninety-one thousand, nine hundred seventy-two".