3991480 has 16 divisors (see below), whose sum is σ = 8980920. Its totient is φ = 1596576.

The previous prime is 3991469. The next prime is 3991511. The reversal of 3991480 is 841993.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49854 + ... + 49933.

Almost surely, 2^3991480 is an apocalyptic number.

It is an amenable number.

3991480 is an abundant number, since it is smaller than the sum of its proper divisors (4989440).

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

3991480 is a wasteful number, since it uses less digits than its factorization.

3991480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99798 (or 99794 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 3991480 is about 1997.8688645654. The cubic root of 3991480 is about 158.6273196064.

It can be divided in two parts, 39 and 91480, that added together give a palindrome (91519).

The spelling of 3991480 in words is "three million, nine hundred ninety-one thousand, four hundred eighty".