1378971 has 16 divisors (see below), whose sum is σ = 2229120. Its totient is φ = 835560.

The previous prime is 1378969. The next prime is 1378997. The reversal of 1378971 is 1798731.

It is not a de Polignac number, because 1378971 - 2¹ = 1378969 is a prime.

It is a super-2 number, since 2×1378971² = 3803122037682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1378961) 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, 2025 + ... + 2618.

It is an arithmetic number, because the mean of its divisors is an integer number (139320).

2^1378971 is an apocalyptic number.

1378971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1378971 is a deficient number, since it is larger than the sum of its proper divisors (850149).

1378971 is a wasteful number, since it uses less digits than its factorization.

1378971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663 (or 4657 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 1378971 is about 1174.2959592879. The cubic root of 1378971 is about 111.3059492174.

The spelling of 1378971 in words is "one million, three hundred seventy-eight thousand, nine hundred seventy-one".