7901985 has 48 divisors (see below), whose sum is σ = 15857856. Its totient is φ = 3330432.

The previous prime is 7901983. The next prime is 7901989. The reversal of 7901985 is 5891097.

It is a happy number.

It is not a de Polignac number, because 7901985 - 2¹ = 7901983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7901983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9142 + ... + 9968.

It is an arithmetic number, because the mean of its divisors is an integer number (330372).

Almost surely, 2^7901985 is an apocalyptic number.

It is an amenable number.

7901985 is an abundant number, since it is smaller than the sum of its proper divisors (7955871).

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

7901985 is a wasteful number, since it uses less digits than its factorization.

7901985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 7901985 is about 2811.0469579856. The cubic root of 7901985 is about 199.1798496980.

It can be divided in two parts, 790 and 1985, that added together give a triangular number (2775 = T₇₄).

The spelling of 7901985 in words is "seven million, nine hundred one thousand, nine hundred eighty-five".