2557972 has 6 divisors (see below), whose sum is σ = 4476458. Its totient is φ = 1278984.

The previous prime is 2557967. The next prime is 2557999. The reversal of 2557972 is 2797552.

It can be written as a sum of positive squares in only one way, i.e., 1971216 + 586756 = 1404^2 + 766^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319743 + ... + 319750.

2^2557972 is an apocalyptic number.

It is an amenable number.

2557972 is a deficient number, since it is larger than the sum of its proper divisors (1918486).

2557972 is a wasteful number, since it uses less digits than its factorization.

2557972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639497 (or 639495 counting only the distinct ones).

The product of its digits is 44100, while the sum is 37.

The square root of 2557972 is about 1599.3661244381. The cubic root of 2557972 is about 136.7619429493.

It can be divided in two parts, 25579 and 72, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 2557972 in words is "two million, five hundred fifty-seven thousand, nine hundred seventy-two".