3978969 has 16 divisors (see below), whose sum is σ = 5713920. Its totient is φ = 2453760.

The previous prime is 3978967. The next prime is 3978971. The reversal of 3978969 is 9698793.

It is an interprime number because it is at equal distance from previous prime (3978967) and next prime (3978971).

It is not a de Polignac number, because 3978969 - 2¹ = 3978967 is a prime.

It is a super-2 number, since 2×3978969² = 31664388605922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (3978967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2472 + ... + 3750.

It is an arithmetic number, because the mean of its divisors is an integer number (357120).

Almost surely, 2^3978969 is an apocalyptic number.

It is an amenable number.

3978969 is a deficient number, since it is larger than the sum of its proper divisors (1734951).

3978969 is a wasteful number, since it uses less digits than its factorization.

3978969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360.

The product of its digits is 734832, while the sum is 51.

The square root of 3978969 is about 1994.7353207882. The cubic root of 3978969 is about 158.4614109270.

The spelling of 3978969 in words is "three million, nine hundred seventy-eight thousand, nine hundred sixty-nine".