3157978 has 8 divisors (see below), whose sum is σ = 4807872. Its totient is φ = 1555356.

The previous prime is 3157961. The next prime is 3157981. The reversal of 3157978 is 8797513.

3157978 = T₆₇ + T₆₈ + ... + T₂₆₇.

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

It is a self number, because there is not a number n which added to its sum of digits gives 3157978.

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, 11650 + ... + 11917.

It is an arithmetic number, because the mean of its divisors is an integer number (600984).

Almost surely, 2^3157978 is an apocalyptic number.

3157978 is a deficient number, since it is larger than the sum of its proper divisors (1649894).

3157978 is a wasteful number, since it uses less digits than its factorization.

3157978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23636.

The product of its digits is 52920, while the sum is 40.

The square root of 3157978 is about 1777.0700605210. The cubic root of 3157978 is about 146.7133724070.

The spelling of 3157978 in words is "three million, one hundred fifty-seven thousand, nine hundred seventy-eight".