213942993 has 16 divisors (see below), whose sum is σ = 315837696. Its totient is φ = 127725840.

The previous prime is 213942979. The next prime is 213943007. The reversal of 213942993 is 399249312.

213942993 = 127² + 128² + ... + 863².

It is an interprime number because it is at equal distance from previous prime (213942979) and next prime (213943007).

It is not a de Polignac number, because 213942993 - 2⁶ = 213942929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213942923) 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, 46171 + ... + 50592.

It is an arithmetic number, because the mean of its divisors is an integer number (19739856).

Almost surely, 2^213942993 is an apocalyptic number.

It is an amenable number.

213942993 is a deficient number, since it is larger than the sum of its proper divisors (101894703).

213942993 is a wasteful number, since it uses less digits than its factorization.

213942993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96844.

The product of its digits is 104976, while the sum is 42.

The square root of 213942993 is about 14626.7902494020. The cubic root of 213942993 is about 598.0892856322.

The spelling of 213942993 in words is "two hundred thirteen million, nine hundred forty-two thousand, nine hundred ninety-three".