1387991654 has 16 divisors (see below), whose sum is σ = 2381488128. Its totient is φ = 594335112.

The previous prime is 1387991611. The next prime is 1387991669. The reversal of 1387991654 is 4561997831.

It is a junction number, because it is equal to n+sod(n) for n = 1387991596 and 1387991605.

It is a congruent number.

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, 26342 + ... + 58905.

It is an arithmetic number, because the mean of its divisors is an integer number (148843008).

Almost surely, 2^1387991654 is an apocalyptic number.

1387991654 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1387991654 is a deficient number, since it is larger than the sum of its proper divisors (993496474).

1387991654 is a wasteful number, since it uses less digits than its factorization.

1387991654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86419.

The product of its digits is 1632960, while the sum is 53.

The square root of 1387991654 is about 37255.7600110372. The cubic root of 1387991654 is about 1115.4812762765.

The spelling of 1387991654 in words is "one billion, three hundred eighty-seven million, nine hundred ninety-one thousand, six hundred fifty-four".