30749213 has 4 divisors (see below), whose sum is σ = 33544608. Its totient is φ = 27953820.

The previous prime is 30749197. The next prime is 30749231. The reversal of 30749213 is 31294703.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31294703 = 11 ⋅2844973.

It is a cyclic number.

It is not a de Polignac number, because 30749213 - 2⁴ = 30749197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30749263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1397681 + ... + 1397702.

It is an arithmetic number, because the mean of its divisors is an integer number (8386152).

Almost surely, 2^30749213 is an apocalyptic number.

It is an amenable number.

30749213 is a deficient number, since it is larger than the sum of its proper divisors (2795395).

30749213 is a wasteful number, since it uses less digits than its factorization.

30749213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795394.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 30749213 is about 5545.1972913504. The cubic root of 30749213 is about 313.2886550400.

Subtracting 30749213 from its reverse (31294703), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 30749213 in words is "thirty million, seven hundred forty-nine thousand, two hundred thirteen".