1947394021 has 8 divisors (see below), whose sum is σ = 1955923200. Its totient is φ = 1938879648.

The previous prime is 1947393989. The next prime is 1947394067. The reversal of 1947394021 is 1204937491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1947394021 - 2⁵ = 1947393989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947394121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319020 + ... + 325066.

It is an arithmetic number, because the mean of its divisors is an integer number (244490400).

Almost surely, 2^1947394021 is an apocalyptic number.

It is an amenable number.

1947394021 is a deficient number, since it is larger than the sum of its proper divisors (8529179).

1947394021 is a wasteful number, since it uses less digits than its factorization.

1947394021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7403.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 1947394021 is about 44129.2875650627. The cubic root of 1947394021 is about 1248.7761933756.

The spelling of 1947394021 in words is "one billion, nine hundred forty-seven million, three hundred ninety-four thousand, twenty-one".