19942951 has 24 divisors (see below), whose sum is σ = 25244160. Its totient is φ = 15649200.

The previous prime is 19942939. The next prime is 19942957. The reversal of 19942951 is 15924991.

It is not a de Polignac number, because 19942951 - 2⁵ = 19942919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19942957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28516 + ... + 29206.

It is an arithmetic number, because the mean of its divisors is an integer number (1051840).

Almost surely, 2^19942951 is an apocalyptic number.

19942951 is a deficient number, since it is larger than the sum of its proper divisors (5301209).

19942951 is a wasteful number, since it uses less digits than its factorization.

19942951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755 (or 748 counting only the distinct ones).

The product of its digits is 29160, while the sum is 40.

The square root of 19942951 is about 4465.7531279729. The cubic root of 19942951 is about 271.1834245213.

The spelling of 19942951 in words is "nineteen million, nine hundred forty-two thousand, nine hundred fifty-one".