1540213 has 4 divisors (see below), whose sum is σ = 1550700. Its totient is φ = 1529728.

The previous prime is 1540211. The next prime is 1540223. The reversal of 1540213 is 3120451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3120451 = 59 ⋅52889.

It can be written as a sum of positive squares in 2 ways, for example, as 116964 + 1423249 = 342^2 + 1193^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540213 - 2¹ = 1540211 is a prime.

It is a super-3 number, since 3×1540213³ = 10961338986043330791, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540211) 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, 5020 + ... + 5317.

It is an arithmetic number, because the mean of its divisors is an integer number (387675).

2^1540213 is an apocalyptic number.

It is an amenable number.

1540213 is a deficient number, since it is larger than the sum of its proper divisors (10487).

1540213 is a wasteful number, since it uses less digits than its factorization.

1540213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10486.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1540213 is about 1241.0531817775. The cubic root of 1540213 is about 115.4853588632.

Adding to 1540213 its reverse (3120451), we get a palindrome (4660664).

The spelling of 1540213 in words is "one million, five hundred forty thousand, two hundred thirteen".