1240001686 has 16 divisors (see below), whose sum is σ = 2318964480. Its totient is φ = 483117480.

The previous prime is 1240001681. The next prime is 1240001687. The reversal of 1240001686 is 6861000421.

It is a super-4 number, since 4×1240001686⁴ (a number of 37 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240001681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4025826 + ... + 4026133.

It is an arithmetic number, because the mean of its divisors is an integer number (144935280).

Almost surely, 2^1240001686 is an apocalyptic number.

1240001686 is a deficient number, since it is larger than the sum of its proper divisors (1078962794).

1240001686 is a wasteful number, since it uses less digits than its factorization.

1240001686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8051979.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1240001686 is about 35213.6576629012. The cubic root of 1240001686 is about 1074.3375579060.

The spelling of 1240001686 in words is "one billion, two hundred forty million, one thousand, six hundred eighty-six".