1386952721640 has 64 divisors (see below), whose sum is σ = 4623175742400. Its totient is φ = 369854058816.

The previous prime is 1386952721599. The next prime is 1386952721647. The reversal of 1386952721640 is 461272596831.

It is a happy number.

1386952721640 is a `hidden beast` number, since 1 + 3 + 8 + 69 + 527 + 2 + 16 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1386952721647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642106662 + ... + 642108821.

It is an arithmetic number, because the mean of its divisors is an integer number (72237120975).

It is a 1-persistent number, because it is pandigital, but 2⋅1386952721640 = 2773905443280 is not.

Almost surely, 2^{1386952721640} is an apocalyptic number.

1386952721640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1386952721640 is an abundant number, since it is smaller than the sum of its proper divisors (3236223020760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1386952721640 is a wasteful number, since it uses less digits than its factorization.

1386952721640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284215503 (or 1284215493 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 1386952721640 in words is "one trillion, three hundred eighty-six billion, nine hundred fifty-two million, seven hundred twenty-one thousand, six hundred forty".