1383402640 has 40 divisors (see below), whose sum is σ = 3226811328. Its totient is φ = 551571840.

The previous prime is 1383402637. The next prime is 1383402641. The reversal of 1383402640 is 462043831.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1383402641) 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, 2922 + ... + 52681.

Almost surely, 2^1383402640 is an apocalyptic number.

1383402640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1383402640 is an abundant number, since it is smaller than the sum of its proper divisors (1843408688).

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

1383402640 is a wasteful number, since it uses less digits than its factorization.

1383402640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55927 (or 55921 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 1383402640 is about 37194.1210408312. The cubic root of 1383402640 is about 1114.2505745783.

The spelling of 1383402640 in words is "one billion, three hundred eighty-three million, four hundred two thousand, six hundred forty".