342490781 has 4 divisors (see below), whose sum is σ = 344541792. Its totient is φ = 340439772.

The previous prime is 342490777. The next prime is 342490807. The reversal of 342490781 is 187094243.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 342490781 - 2² = 342490777 is a prime.

It is a super-2 number, since 2×342490781² = 234599870139979922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (342490711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025255 + ... + 1025588.

It is an arithmetic number, because the mean of its divisors is an integer number (86135448).

Almost surely, 2^342490781 is an apocalyptic number.

It is an amenable number.

342490781 is a deficient number, since it is larger than the sum of its proper divisors (2051011).

342490781 is a wasteful number, since it uses less digits than its factorization.

342490781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051010.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 342490781 is about 18506.5064504352. The cubic root of 342490781 is about 699.6534209496.

The spelling of 342490781 in words is "three hundred forty-two million, four hundred ninety thousand, seven hundred eighty-one".