947897819 has 32 divisors (see below), whose sum is σ = 1103155200. Its totient is φ = 806400000.

The previous prime is 947897809. The next prime is 947897887. The reversal of 947897819 is 918798749.

It is a cyclic number.

It is not a de Polignac number, because 947897819 - 2⁴ = 947897803 is a prime.

It is a super-4 number, since 4×947897819⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (947897809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2110907 + ... + 2111355.

It is an arithmetic number, because the mean of its divisors is an integer number (34473600).

Almost surely, 2^947897819 is an apocalyptic number.

947897819 is a deficient number, since it is larger than the sum of its proper divisors (155257381).

947897819 is a wasteful number, since it uses less digits than its factorization.

947897819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683.

The product of its digits is 9144576, while the sum is 62.

The square root of 947897819 is about 30787.9492496659. The cubic root of 947897819 is about 982.3219338587.

The spelling of 947897819 in words is "nine hundred forty-seven million, eight hundred ninety-seven thousand, eight hundred nineteen".