402742 has 8 divisors (see below), whose sum is σ = 612000. Its totient is φ = 198744.

The previous prime is 402739. The next prime is 402751. The reversal of 402742 is 247204.

402742 is nontrivially palindromic in base 15.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×402742² = 324402237128, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1117 + ... + 1432.

It is an arithmetic number, because the mean of its divisors is an integer number (76500).

2⁴⁰²⁷⁴² is an apocalyptic number.

402742 is a deficient number, since it is larger than the sum of its proper divisors (209258).

402742 is a wasteful number, since it uses less digits than its factorization.

402742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630.

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 402742 is about 634.6195710818. The cubic root of 402742 is about 73.8486069676.

Adding to 402742 its reverse (247204), we get a palindrome (649946).

The spelling of 402742 in words is "four hundred two thousand, seven hundred forty-two", and thus it is an iban number.