19621742 has 16 divisors (see below), whose sum is σ = 33986400. Its totient is φ = 8322048.

The previous prime is 19621733. The next prime is 19621753. The reversal of 19621742 is 24712691.

It is a happy number.

It is a super-2 number, since 2×19621742² = 770025518229128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19621699 and 19621708.

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, 5867 + ... + 8582.

It is an arithmetic number, because the mean of its divisors is an integer number (2124150).

Almost surely, 2^19621742 is an apocalyptic number.

19621742 is a deficient number, since it is larger than the sum of its proper divisors (14364658).

19621742 is a wasteful number, since it uses less digits than its factorization.

19621742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14555.

The product of its digits is 6048, while the sum is 32.

The square root of 19621742 is about 4429.6435522511. The cubic root of 19621742 is about 269.7196083231.

The spelling of 19621742 in words is "nineteen million, six hundred twenty-one thousand, seven hundred forty-two".