2581972 has 6 divisors (see below), whose sum is σ = 4518458. Its totient is φ = 1290984.

The previous prime is 2581963. The next prime is 2581973. The reversal of 2581972 is 2791852.

It can be written as a sum of positive squares in only one way, i.e., 2114116 + 467856 = 1454^2 + 684^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322743 + ... + 322750.

2^2581972 is an apocalyptic number.

It is an amenable number.

2581972 is a deficient number, since it is larger than the sum of its proper divisors (1936486).

2581972 is a wasteful number, since it uses less digits than its factorization.

2581972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645497 (or 645495 counting only the distinct ones).

The product of its digits is 10080, while the sum is 34.

The square root of 2581972 is about 1606.8515799538. The cubic root of 2581972 is about 137.1883321003.

It can be divided in two parts, 2581 and 972, that added together give a palindrome (3553).

The spelling of 2581972 in words is "two million, five hundred eighty-one thousand, nine hundred seventy-two".