19771942 has 8 divisors (see below), whose sum is σ = 29700576. Its totient is φ = 9871752.

The previous prime is 19771937. The next prime is 19771943. The reversal of 19771942 is 24917791.

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

It is a junction number, because it is equal to n+sod(n) for n = 19771895 and 19771904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19771943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5278 + ... + 8209.

It is an arithmetic number, because the mean of its divisors is an integer number (3712572).

Almost surely, 2^19771942 is an apocalyptic number.

19771942 is a deficient number, since it is larger than the sum of its proper divisors (9928634).

19771942 is a wasteful number, since it uses less digits than its factorization.

19771942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14222.

The product of its digits is 31752, while the sum is 40.

The square root of 19771942 is about 4446.5651912459. The cubic root of 19771942 is about 270.4060739243.

The spelling of 19771942 in words is "nineteen million, seven hundred seventy-one thousand, nine hundred forty-two".