212878408 has 16 divisors (see below), whose sum is σ = 399360060. Its totient is φ = 106382400.

The previous prime is 212878387. The next prime is 212878429. The reversal of 212878408 is 804878212.

It is an interprime number because it is at equal distance from previous prime (212878387) and next prime (212878429).

It can be written as a sum of positive squares in 2 ways, for example, as 181764324 + 31114084 = 13482^2 + 5578^2 .

It is a super-2 number, since 2×212878408² = 90634433185228928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11778 + ... + 23758.

Almost surely, 2^212878408 is an apocalyptic number.

It is an amenable number.

212878408 is a deficient number, since it is larger than the sum of its proper divisors (186481652).

212878408 is a wasteful number, since it uses less digits than its factorization.

212878408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14208 (or 14204 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 212878408 is about 14590.3532513781. The cubic root of 212878408 is about 597.0956004949.

The spelling of 212878408 in words is "two hundred twelve million, eight hundred seventy-eight thousand, four hundred eight".