2477978 has 4 divisors (see below), whose sum is σ = 3716970. Its totient is φ = 1238988.

The previous prime is 2477957. The next prime is 2477983. The reversal of 2477978 is 8797742.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1423249 + 1054729 = 1193^2 + 1027^2 .

It is a super-2 number, since 2×2477978² = 12280749936968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619493 + ... + 619496.

2^2477978 is an apocalyptic number.

2477978 is a deficient number, since it is larger than the sum of its proper divisors (1238992).

2477978 is a wasteful number, since it uses less digits than its factorization.

2477978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238991.

The product of its digits is 197568, while the sum is 44.

The square root of 2477978 is about 1574.1594582507. The cubic root of 2477978 is about 135.3211922316.

The spelling of 2477978 in words is "two million, four hundred seventy-seven thousand, nine hundred seventy-eight".