19770138 has 12 divisors (see below), whose sum is σ = 42835338. Its totient is φ = 6590040.

The previous prime is 19770137. The next prime is 19770139. The reversal of 19770138 is 83107791.

It is an interprime number because it is at equal distance from previous prime (19770137) and next prime (19770139).

It can be written as a sum of positive squares in only one way, i.e., 11108889 + 8661249 = 3333^2 + 2943^2 .

It is not an unprimeable number, because it can be changed into a prime (19770137) 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 5 ways as a sum of consecutive naturals, for example, 549153 + ... + 549188.

Almost surely, 2^19770138 is an apocalyptic number.

19770138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19770138 is an abundant number, since it is smaller than the sum of its proper divisors (23065200).

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

19770138 is a wasteful number, since it uses less digits than its factorization.

19770138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098349 (or 1098346 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 19770138 is about 4446.3623334137. The cubic root of 19770138 is about 270.3978496876.

The spelling of 19770138 in words is "nineteen million, seven hundred seventy thousand, one hundred thirty-eight".