212897457 has 8 divisors (see below), whose sum is σ = 315403680. Its totient is φ = 141931620.

The previous prime is 212897441. The next prime is 212897473. The reversal of 212897457 is 754798212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (212897441) and next prime (212897473).

It is not a de Polignac number, because 212897457 - 2⁴ = 212897441 is a prime.

It is a super-3 number, since 3×212897457³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (212897437) 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 7 ways as a sum of consecutive naturals, for example, 3942519 + ... + 3942572.

It is an arithmetic number, because the mean of its divisors is an integer number (39425460).

Almost surely, 2^212897457 is an apocalyptic number.

212897457 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

212897457 is a deficient number, since it is larger than the sum of its proper divisors (102506223).

212897457 is an equidigital number, since it uses as much as digits as its factorization.

212897457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7885100 (or 7885094 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 212897457 is about 14591.0060311138. The cubic root of 212897457 is about 597.1134099336.

The spelling of 212897457 in words is "two hundred twelve million, eight hundred ninety-seven thousand, four hundred fifty-seven".