1386640972 has 24 divisors (see below), whose sum is σ = 2571654960. Its totient is φ = 651955200.

The previous prime is 1386640963. The next prime is 1386640987. The reversal of 1386640972 is 2790466831.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73179 + ... + 90157.

It is an arithmetic number, because the mean of its divisors is an integer number (107152290).

Almost surely, 2^1386640972 is an apocalyptic number.

It is an amenable number.

1386640972 is a deficient number, since it is larger than the sum of its proper divisors (1185013988).

1386640972 is a wasteful number, since it uses less digits than its factorization.

1386640972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18201 (or 18199 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 1386640972 is about 37237.6284422088. The cubic root of 1386640972 is about 1115.1193265819.

The spelling of 1386640972 in words is "one billion, three hundred eighty-six million, six hundred forty thousand, nine hundred seventy-two".