19774940 has 24 divisors (see below), whose sum is σ = 43333920. Its totient is φ = 7565888.

The previous prime is 19774939. The next prime is 19774981. The reversal of 19774940 is 4947791.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21035 + ... + 21954.

It is an arithmetic number, because the mean of its divisors is an integer number (1805580).

Almost surely, 2^19774940 is an apocalyptic number.

19774940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19774940 is an abundant number, since it is smaller than the sum of its proper divisors (23558980).

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

19774940 is a wasteful number, since it uses less digits than its factorization.

19774940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43021 (or 43019 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 19774940 is about 4446.9022926077. The cubic root of 19774940 is about 270.4197403688.

The spelling of 19774940 in words is "nineteen million, seven hundred seventy-four thousand, nine hundred forty".