7914989391 has 16 divisors (see below), whose sum is σ = 11113251840. Its totient is φ = 4996918080.

The previous prime is 7914989389. The next prime is 7914989437. The reversal of 7914989391 is 1939894197.

It is a happy number.

It is not a de Polignac number, because 7914989391 - 2¹ = 7914989389 is a prime.

It is a super-3 number, since 3×7914989391³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7914989321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120891 + ... + 174483.

It is an arithmetic number, because the mean of its divisors is an integer number (694578240).

Almost surely, 2^7914989391 is an apocalyptic number.

7914989391 is a deficient number, since it is larger than the sum of its proper divisors (3198262449).

7914989391 is a wasteful number, since it uses less digits than its factorization.

7914989391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56206.

The product of its digits is 4408992, while the sum is 60.

The square root of 7914989391 is about 88966.2261254236. The cubic root of 7914989391 is about 1992.8905403202.

The spelling of 7914989391 in words is "seven billion, nine hundred fourteen million, nine hundred eighty-nine thousand, three hundred ninety-one".