7891438254 has 32 divisors (see below), whose sum is σ = 18067347456. Its totient is φ = 2250974880.

The previous prime is 7891438249. The next prime is 7891438271. The reversal of 7891438254 is 4528341987.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7891438197 and 7891438206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129277 + ... + 180264.

It is an arithmetic number, because the mean of its divisors is an integer number (564604608).

Almost surely, 2^7891438254 is an apocalyptic number.

7891438254 is an abundant number, since it is smaller than the sum of its proper divisors (10175909202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7891438254 is a wasteful number, since it uses less digits than its factorization.

7891438254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310160.

The product of its digits is 1935360, while the sum is 51.

The square root of 7891438254 is about 88833.7675323973. The cubic root of 7891438254 is about 1990.9119540946.

The spelling of 7891438254 in words is "seven billion, eight hundred ninety-one million, four hundred thirty-eight thousand, two hundred fifty-four".