1978734 has 8 divisors (see below), whose sum is σ = 3957480. Its totient is φ = 659576.

The previous prime is 1978727. The next prime is 1978741. The reversal of 1978734 is 4378791.

It is an interprime number because it is at equal distance from previous prime (1978727) and next prime (1978741).

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

1978734 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1978692 and 1978701.

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, 164889 + ... + 164900.

It is an arithmetic number, because the mean of its divisors is an integer number (494685).

2^1978734 is an apocalyptic number.

1978734 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1978734 is a wasteful number, since it uses less digits than its factorization.

1978734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329794.

The product of its digits is 42336, while the sum is 39.

The square root of 1978734 is about 1406.6748025041. The cubic root of 1978734 is about 125.5439548051.

The spelling of 1978734 in words is "one million, nine hundred seventy-eight thousand, seven hundred thirty-four".