19940490 has 48 divisors (see below), whose sum is σ = 54899208. Its totient is φ = 5004288.

The previous prime is 19940489. The next prime is 19940497. The reversal of 19940490 is 9404991.

It can be written as a sum of positive squares in 4 ways, for example, as 18688329 + 1252161 = 4323^2 + 1119^2 .

It is not an unprimeable number, because it can be changed into a prime (19940497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4987 + ... + 8046.

Almost surely, 2^19940490 is an apocalyptic number.

19940490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19940490 is an abundant number, since it is smaller than the sum of its proper divisors (34958718).

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

19940490 is a wasteful number, since it uses less digits than its factorization.

19940490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13063 (or 13060 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19940490 is about 4465.4775780425. The cubic root of 19940490 is about 271.1722692036.

The spelling of 19940490 in words is "nineteen million, nine hundred forty thousand, four hundred ninety".