19401969 has 4 divisors (see below), whose sum is σ = 25869296. Its totient is φ = 12934644.

The previous prime is 19401961. The next prime is 19402003. The reversal of 19401969 is 96910491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96910491 = 3 ⋅32303497.

It is not a de Polignac number, because 19401969 - 2³ = 19401961 is a prime.

It is a super-2 number, since 2×19401969² = 752872802153922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19401961) 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, 3233659 + ... + 3233664.

It is an arithmetic number, because the mean of its divisors is an integer number (6467324).

Almost surely, 2^19401969 is an apocalyptic number.

It is an amenable number.

19401969 is a deficient number, since it is larger than the sum of its proper divisors (6467327).

19401969 is an equidigital number, since it uses as much as digits as its factorization.

19401969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6467326.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 19401969 is about 4404.7666226487. The cubic root of 19401969 is about 268.7088284505.

The spelling of 19401969 in words is "nineteen million, four hundred one thousand, nine hundred sixty-nine".