19961742 has 16 divisors (see below), whose sum is σ = 42024960. Its totient is φ = 6303672.

The previous prime is 19961729. The next prime is 19961743. The reversal of 19961742 is 24716991.

It is a super-2 number, since 2×19961742² = 796942287349128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19961742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19961743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87438 + ... + 87665.

It is an arithmetic number, because the mean of its divisors is an integer number (2626560).

Almost surely, 2^19961742 is an apocalyptic number.

19961742 is an abundant number, since it is smaller than the sum of its proper divisors (22063218).

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

19961742 is a wasteful number, since it uses less digits than its factorization.

19961742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175127.

The product of its digits is 27216, while the sum is 39.

The square root of 19961742 is about 4467.8565330592. The cubic root of 19961742 is about 271.2685708650.

The spelling of 19961742 in words is "nineteen million, nine hundred sixty-one thousand, seven hundred forty-two".