781402225 has 12 divisors (see below), whose sum is σ = 969291136. Its totient is φ = 624894480.

The previous prime is 781402217. The next prime is 781402243. The reversal of 781402225 is 522204187.

It is a happy number.

It is not a de Polignac number, because 781402225 - 2³ = 781402217 is a prime.

It is a super-2 number, since 2×781402225² = 1221178874469901250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 113224 + ... + 119926.

Almost surely, 2^781402225 is an apocalyptic number.

It is an amenable number.

781402225 is a deficient number, since it is larger than the sum of its proper divisors (187888911).

781402225 is a wasteful number, since it uses less digits than its factorization.

781402225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11376 (or 11371 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 781402225 is about 27953.5726696964. The cubic root of 781402225 is about 921.0676896228.

The spelling of 781402225 in words is "seven hundred eighty-one million, four hundred two thousand, two hundred twenty-five".