840130 has 16 divisors (see below), whose sum is σ = 1564920. Its totient is φ = 324352.

The previous prime is 840109. The next prime is 840137. The reversal of 840130 is 31048.

840130 = 156² + 157² + ... + 184².

It can be written as a sum of positive squares in 4 ways, for example, as 514089 + 326041 = 717^2 + 571^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (840137) by changing a digit.

840130 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1159 + ... + 1738.

2⁸⁴⁰¹³⁰ is an apocalyptic number.

840130 is the 580-th heptagonal number.

840130 is a deficient number, since it is larger than the sum of its proper divisors (724790).

840130 is a wasteful number, since it uses less digits than its factorization.

840130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2933.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 840130 is about 916.5860570617. The cubic root of 840130 is about 94.3587468173.

Adding to 840130 its reverse (31048), we get a palindrome (871178).

The spelling of 840130 in words is "eight hundred forty thousand, one hundred thirty".