19444990 has 8 divisors (see below), whose sum is σ = 35001000. Its totient is φ = 7777992.

The previous prime is 19444969. The next prime is 19445009. The reversal of 19444990 is 9944491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19444990² = 756215272200200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972240 + ... + 972259.

It is an arithmetic number, because the mean of its divisors is an integer number (4375125).

Almost surely, 2^19444990 is an apocalyptic number.

19444990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19444990 is a deficient number, since it is larger than the sum of its proper divisors (15556010).

19444990 is a wasteful number, since it uses less digits than its factorization.

19444990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944506.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 19444990 is about 4409.6473781925. The cubic root of 19444990 is about 268.9072892138.

The spelling of 19444990 in words is "nineteen million, four hundred forty-four thousand, nine hundred ninety".