247402225 has 18 divisors (see below), whose sum is σ = 356866854. Its totient is φ = 169646400.

The previous prime is 247402213. The next prime is 247402229. The reversal of 247402225 is 522204742.

It can be written as a sum of positive squares in 3 ways, for example, as 784 + 247401441 = 28^2 + 15729^2 .

It is not a de Polignac number, because 247402225 - 2⁵ = 247402193 is a prime.

It is a super-2 number, since 2×247402225² = 122415721869901250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 247402193 and 247402202.

It is not an unprimeable number, because it can be changed into a prime (247402229) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 99756 + ... + 102205.

Almost surely, 2^247402225 is an apocalyptic number.

247402225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

247402225 is a deficient number, since it is larger than the sum of its proper divisors (109464629).

247402225 is a wasteful number, since it uses less digits than its factorization.

247402225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201985 (or 201973 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 247402225 is about 15729.0249220986. The cubic root of 247402225 is about 627.7709289693.

Adding to 247402225 its reverse (522204742), we get a palindrome (769606967).

The spelling of 247402225 in words is "two hundred forty-seven million, four hundred two thousand, two hundred twenty-five".