19914457 has 4 divisors (see below), whose sum is σ = 20059956. Its totient is φ = 19768960.

The previous prime is 19914449. The next prime is 19914467. The reversal of 19914457 is 75441991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75441991 = 743 ⋅101537.

It can be written as a sum of positive squares in 2 ways, for example, as 16451136 + 3463321 = 4056^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 19914457 - 2³ = 19914449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19914467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72544 + ... + 72817.

It is an arithmetic number, because the mean of its divisors is an integer number (5014989).

Almost surely, 2^19914457 is an apocalyptic number.

It is an amenable number.

19914457 is a deficient number, since it is larger than the sum of its proper divisors (145499).

19914457 is a wasteful number, since it uses less digits than its factorization.

19914457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145498.

The product of its digits is 45360, while the sum is 40.

The square root of 19914457 is about 4462.5617082568. The cubic root of 19914457 is about 271.0542095501.

The spelling of 19914457 in words is "nineteen million, nine hundred fourteen thousand, four hundred fifty-seven".