1399781754 has 24 divisors (see below), whose sum is σ = 3466126560. Its totient is φ = 399937608.

The previous prime is 1399781749. The next prime is 1399781797. The reversal of 1399781754 is 4571879931.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1399781754.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5554564 + ... + 5554815.

It is an arithmetic number, because the mean of its divisors is an integer number (144421940).

Almost surely, 2^1399781754 is an apocalyptic number.

1399781754 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1399781754 is an abundant number, since it is smaller than the sum of its proper divisors (2066344806).

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

1399781754 is a wasteful number, since it uses less digits than its factorization.

1399781754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11109394 (or 11109391 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 1399781754 is about 37413.6573192197. The cubic root of 1399781754 is about 1118.6308082541.

The spelling of 1399781754 in words is "one billion, three hundred ninety-nine million, seven hundred eighty-one thousand, seven hundred fifty-four".