1971438 has 32 divisors (see below), whose sum is σ = 4574976. Its totient is φ = 554688.

The previous prime is 1971433. The next prime is 1971443. The reversal of 1971438 is 8341791.

It is an interprime number because it is at equal distance from previous prime (1971433) and next prime (1971443).

It is a junction number, because it is equal to n+sod(n) for n = 1971399 and 1971408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971433) 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, 2745 + ... + 3387.

It is an arithmetic number, because the mean of its divisors is an integer number (142968).

2^1971438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1971438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2287488).

1971438 is an abundant number, since it is smaller than the sum of its proper divisors (2603538).

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

1971438 is a wasteful number, since it uses less digits than its factorization.

1971438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its digits is 6048, while the sum is 33.

The square root of 1971438 is about 1404.0790576032. The cubic root of 1971438 is about 125.3894626240.

The spelling of 1971438 in words is "one million, nine hundred seventy-one thousand, four hundred thirty-eight".