212447457 has 6 divisors (see below), whose sum is σ = 306868562. Its totient is φ = 141631632.

The previous prime is 212447449. The next prime is 212447467. The reversal of 212447457 is 754744212.

It can be written as a sum of positive squares in only one way, i.e., 210134016 + 2313441 = 14496^2 + 1521^2 .

It is not a de Polignac number, because 212447457 - 2³ = 212447449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212447467) 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 5 ways as a sum of consecutive naturals, for example, 11802628 + ... + 11802645.

Almost surely, 2^212447457 is an apocalyptic number.

It is an amenable number.

212447457 is a deficient number, since it is larger than the sum of its proper divisors (94421105).

212447457 is a wasteful number, since it uses less digits than its factorization.

212447457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23605279 (or 23605276 counting only the distinct ones).

The product of its digits is 62720, while the sum is 36.

The square root of 212447457 is about 14575.5774156635. The cubic root of 212447457 is about 596.6924082330.

The spelling of 212447457 in words is "two hundred twelve million, four hundred forty-seven thousand, four hundred fifty-seven".