1939454947 has 2 divisors, whose sum is σ = 1939454948. Its totient is φ = 1939454946.

The previous prime is 1939454927. The next prime is 1939454983. The reversal of 1939454947 is 7494549391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1939454947 - 2¹¹ = 1939452899 is a prime.

It is a super-3 number, since 3×1939454947³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1939454927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969727473 + 969727474.

It is an arithmetic number, because the mean of its divisors is an integer number (969727474).

Almost surely, 2^1939454947 is an apocalyptic number.

1939454947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939454947 is an equidigital number, since it uses as much as digits as its factorization.

1939454947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 55.

The square root of 1939454947 is about 44039.2432609826. The cubic root of 1939454947 is about 1247.0768917053.

The spelling of 1939454947 in words is "one billion, nine hundred thirty-nine million, four hundred fifty-four thousand, nine hundred forty-seven".