840202153442 has 4 divisors (see below), whose sum is σ = 1260303230166. Its totient is φ = 420101076720.

The previous prime is 840202153429. The next prime is 840202153459. The reversal of 840202153442 is 244351202048.

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

It can be written as a sum of positive squares in only one way, i.e., 742438999201 + 97763154241 = 861649^2 + 312671^2 .

It is a super-2 number, since 2×840202153442² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210050538359 + ... + 210050538362.

Almost surely, 2^840202153442 is an apocalyptic number.

840202153442 is a deficient number, since it is larger than the sum of its proper divisors (420101076724).

840202153442 is a wasteful number, since it uses less digits than its factorization.

840202153442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420101076723.

The product of its (nonzero) digits is 61440, while the sum is 35.

The spelling of 840202153442 in words is "eight hundred forty billion, two hundred two million, one hundred fifty-three thousand, four hundred forty-two".