306405142 has 4 divisors (see below), whose sum is σ = 459607716. Its totient is φ = 153202570.

The previous prime is 306405139. The next prime is 306405157. The reversal of 306405142 is 241504603.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×306405142² = 187768222088080328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76601284 + ... + 76601287.

It is an arithmetic number, because the mean of its divisors is an integer number (114901929).

Almost surely, 2^306405142 is an apocalyptic number.

306405142 is a deficient number, since it is larger than the sum of its proper divisors (153202574).

306405142 is a wasteful number, since it uses less digits than its factorization.

306405142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153202573.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 306405142 is about 17504.4320673365. The cubic root of 306405142 is about 674.1636771667.

Adding to 306405142 its reverse (241504603), we get a palindrome (547909745).

The spelling of 306405142 in words is "three hundred six million, four hundred five thousand, one hundred forty-two".