212040978 has 16 divisors (see below), whose sum is σ = 427422720. Its totient is φ = 70123536.

The previous prime is 212040973. The next prime is 212040989. The reversal of 212040978 is 879040212.

It is a happy number.

212040978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212040978² = 89922752702392968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212040973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138373 + ... + 139896.

It is an arithmetic number, because the mean of its divisors is an integer number (26713920).

Almost surely, 2^212040978 is an apocalyptic number.

212040978 is an abundant number, since it is smaller than the sum of its proper divisors (215381742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212040978 is a wasteful number, since it uses less digits than its factorization.

212040978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278401.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 212040978 is about 14561.6269008652. The cubic root of 212040978 is about 596.3116116688.

The spelling of 212040978 in words is "two hundred twelve million, forty thousand, nine hundred seventy-eight".