194420731 has 4 divisors (see below), whose sum is σ = 194706072. Its totient is φ = 194135392.

The previous prime is 194420701. The next prime is 194420803. The reversal of 194420731 is 137024491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 194420731 - 2¹⁷ = 194289659 is a prime.

It is a super-2 number, since 2×194420731² = 75598841285148722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 194420693 and 194420702.

It is not an unprimeable number, because it can be changed into a prime (194420701) 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, 141646 + ... + 143011.

It is an arithmetic number, because the mean of its divisors is an integer number (48676518).

Almost surely, 2^194420731 is an apocalyptic number.

194420731 is a deficient number, since it is larger than the sum of its proper divisors (285341).

194420731 is an equidigital number, since it uses as much as digits as its factorization.

194420731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285340.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 194420731 is about 13943.4834600253. The cubic root of 194420731 is about 579.3142221718.

The spelling of 194420731 in words is "one hundred ninety-four million, four hundred twenty thousand, seven hundred thirty-one".