8401946389 has 4 divisors (see below), whose sum is σ = 8544352320. Its totient is φ = 8259540460.

The previous prime is 8401946387. The next prime is 8401946411. The reversal of 8401946389 is 9836491048.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8401946389 - 2¹ = 8401946387 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 (8401946387) 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, 71202877 + ... + 71202994.

It is an arithmetic number, because the mean of its divisors is an integer number (2136088080).

Almost surely, 2^8401946389 is an apocalyptic number.

It is an amenable number.

8401946389 is a deficient number, since it is larger than the sum of its proper divisors (142405931).

8401946389 is a wasteful number, since it uses less digits than its factorization.

8401946389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142405930.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The square root of 8401946389 is about 91662.1317066104. The cubic root of 8401946389 is about 2032.9497096542.

The spelling of 8401946389 in words is "eight billion, four hundred one million, nine hundred forty-six thousand, three hundred eighty-nine".