2138972 has 24 divisors (see below), whose sum is σ = 4121712. Its totient is φ = 963200.

The previous prime is 2138971. The next prime is 2138987. The reversal of 2138972 is 2798312.

Added to its reverse (2798312) it gives a square (4937284 = 2222²).

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁵ + 1 + 3⁸ + 8 + 9² + 7⁴ + 2²¹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7472 + ... + 7752.

It is an arithmetic number, because the mean of its divisors is an integer number (171738).

2^2138972 is an apocalyptic number.

2138972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2138972 is a deficient number, since it is larger than the sum of its proper divisors (1982740).

2138972 is a wasteful number, since it uses less digits than its factorization.

2138972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 467 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 2138972 is about 1462.5224784597. The cubic root of 2138972 is about 128.8452363513.

Adding to 2138972 its reverse (2798312), we get a square (4937284 = 2222²).

The spelling of 2138972 in words is "two million, one hundred thirty-eight thousand, nine hundred seventy-two".