194964721 has 16 divisors (see below), whose sum is σ = 246184704. Its totient is φ = 150441984.

The previous prime is 194964701. The next prime is 194964727. The reversal of 194964721 is 127469491.

194964721 = 2134² + 2135² + ... + 2175².

It is not a de Polignac number, because 194964721 - 2⁵ = 194964689 is a prime.

It is a super-2 number, since 2×194964721² = 76022484869215682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194964727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32880 + ... + 38353.

It is an arithmetic number, because the mean of its divisors is an integer number (15386544).

Almost surely, 2^194964721 is an apocalyptic number.

It is an amenable number.

194964721 is a deficient number, since it is larger than the sum of its proper divisors (51219983).

194964721 is a wasteful number, since it uses less digits than its factorization.

194964721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71280.

The product of its digits is 108864, while the sum is 43.

The square root of 194964721 is about 13962.9767957982. The cubic root of 194964721 is about 579.8540268796.

The spelling of 194964721 in words is "one hundred ninety-four million, nine hundred sixty-four thousand, seven hundred twenty-one".