55072397 has 4 divisors (see below), whose sum is σ = 55089276. Its totient is φ = 55055520.

The previous prime is 55072361. The next prime is 55072417. The reversal of 55072397 is 79327055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79327055 = 5 ⋅15865411.

It can be written as a sum of positive squares in 2 ways, for example, as 45549001 + 9523396 = 6749^2 + 3086^2 .

It is a cyclic number.

It is not a de Polignac number, because 55072397 - 2¹² = 55068301 is a prime.

It is a super-2 number, since 2×55072397² = 6065937822651218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55072397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55077397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1808 + ... + 10649.

It is an arithmetic number, because the mean of its divisors is an integer number (13772319).

Almost surely, 2^55072397 is an apocalyptic number.

It is an amenable number.

55072397 is a deficient number, since it is larger than the sum of its proper divisors (16879).

55072397 is a wasteful number, since it uses less digits than its factorization.

55072397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16878.

The product of its (nonzero) digits is 66150, while the sum is 38.

The square root of 55072397 is about 7421.0778866685. The cubic root of 55072397 is about 380.4620349455.

The spelling of 55072397 in words is "fifty-five million, seventy-two thousand, three hundred ninety-seven".