210774138 has 16 divisors (see below), whose sum is σ = 423879456. Its totient is φ = 69869520.

The previous prime is 210774127. The next prime is 210774149. The reversal of 210774138 is 831477012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (210774127) and next prime (210774149).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210774099 and 210774108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95956 + ... + 98127.

It is an arithmetic number, because the mean of its divisors is an integer number (26492466).

Almost surely, 2^210774138 is an apocalyptic number.

210774138 is an abundant number, since it is smaller than the sum of its proper divisors (213105318).

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

210774138 is a wasteful number, since it uses less digits than its factorization.

210774138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194269.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 210774138 is about 14518.0624740356. The cubic root of 210774138 is about 595.1216830903.

It can be divided in two parts, 2107 and 74138, that added together give a triangular number (76245 = T₃₉₀).

The spelling of 210774138 in words is "two hundred ten million, seven hundred seventy-four thousand, one hundred thirty-eight".