1978386 has 16 divisors (see below), whose sum is σ = 3975264. Its totient is φ = 656384.

The previous prime is 1978363. The next prime is 1978393. The reversal of 1978386 is 6838791.

It is a super-2 number, since 2×1978386² = 7828022329992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901 + ... + 2183.

It is an arithmetic number, because the mean of its divisors is an integer number (248454).

2^1978386 is an apocalyptic number.

1978386 is an abundant number, since it is smaller than the sum of its proper divisors (1996878).

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

1978386 is a wasteful number, since it uses less digits than its factorization.

1978386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545.

The product of its digits is 72576, while the sum is 42.

The square root of 1978386 is about 1406.5511010980. The cubic root of 1978386 is about 125.5365945674.

The spelling of 1978386 in words is "one million, nine hundred seventy-eight thousand, three hundred eighty-six".