1243953213 has 16 divisors (see below), whose sum is σ = 1722026496. Its totient is φ = 797901120.

The previous prime is 1243953211. The next prime is 1243953247. The reversal of 1243953213 is 3123593421.

It is not a de Polignac number, because 1243953213 - 2¹ = 1243953211 is a prime.

It is a super-2 number, since 2×1243953213² = 3094839192266046738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243953211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22570 + ... + 54747.

It is an arithmetic number, because the mean of its divisors is an integer number (107626656).

Almost surely, 2^1243953213 is an apocalyptic number.

It is an amenable number.

1243953213 is a deficient number, since it is larger than the sum of its proper divisors (478073283).

1243953213 is a wasteful number, since it uses less digits than its factorization.

1243953213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77524.

The product of its digits is 19440, while the sum is 33.

The square root of 1243953213 is about 35269.7209090177. The cubic root of 1243953213 is about 1075.4775489224.

The spelling of 1243953213 in words is "one billion, two hundred forty-three million, nine hundred fifty-three thousand, two hundred thirteen".