213402724 has 6 divisors (see below), whose sum is σ = 373454774. Its totient is φ = 106701360.

The previous prime is 213402691. The next prime is 213402727. The reversal of 213402724 is 427204312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 206209600 + 7193124 = 14360^2 + 2682^2 .

It is a super-2 number, since 2×213402724² = 91081445221240352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213402727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26675337 + ... + 26675344.

Almost surely, 2^213402724 is an apocalyptic number.

It is an amenable number.

213402724 is a deficient number, since it is larger than the sum of its proper divisors (160052050).

213402724 is a wasteful number, since it uses less digits than its factorization.

213402724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53350685 (or 53350683 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 213402724 is about 14608.3101007611. The cubic root of 213402724 is about 597.5854107812.

The spelling of 213402724 in words is "two hundred thirteen million, four hundred two thousand, seven hundred twenty-four".