3991453478 has 8 divisors (see below), whose sum is σ = 5987630160. Its totient is φ = 1995576760.

The previous prime is 3991453447. The next prime is 3991453507. The reversal of 3991453478 is 8743541993.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 38093 + ... + 97128.

It is an arithmetic number, because the mean of its divisors is an integer number (748453770).

Almost surely, 2^3991453478 is an apocalyptic number.

3991453478 is a deficient number, since it is larger than the sum of its proper divisors (1996176682).

3991453478 is a wasteful number, since it uses less digits than its factorization.

3991453478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149982.

The product of its digits is 3265920, while the sum is 53.

The square root of 3991453478 is about 63177.9508847826. The cubic root of 3991453478 is about 1586.2696826447.

The spelling of 3991453478 in words is "three billion, nine hundred ninety-one million, four hundred fifty-three thousand, four hundred seventy-eight".