213763978 has 16 divisors (see below), whose sum is σ = 336729600. Its totient is φ = 101580336.

The previous prime is 213763973. The next prime is 213763981. The reversal of 213763978 is 879367312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (213763973) 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, 7578 + ... + 22021.

It is an arithmetic number, because the mean of its divisors is an integer number (21045600).

Almost surely, 2^213763978 is an apocalyptic number.

213763978 is a deficient number, since it is larger than the sum of its proper divisors (122965622).

213763978 is a wasteful number, since it uses less digits than its factorization.

213763978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29781.

The product of its digits is 381024, while the sum is 46.

The square root of 213763978 is about 14620.6695469120. The cubic root of 213763978 is about 597.9224236903.

The spelling of 213763978 in words is "two hundred thirteen million, seven hundred sixty-three thousand, nine hundred seventy-eight".