1387357240 has 32 divisors (see below), whose sum is σ = 3257275680. Its totient is φ = 530814592.

The previous prime is 1387357207. The next prime is 1387357241. The reversal of 1387357240 is 427537831.

It is a happy number.

It is a super-2 number, since 2×1387357240² = 3849520222760835200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1387357193 and 1387357202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387357241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753079 + ... + 754918.

It is an arithmetic number, because the mean of its divisors is an integer number (101789865).

Almost surely, 2^1387357240 is an apocalyptic number.

1387357240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387357240 is an abundant number, since it is smaller than the sum of its proper divisors (1869918440).

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

1387357240 is a wasteful number, since it uses less digits than its factorization.

1387357240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508031 (or 1508027 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 1387357240 is about 37247.2447303153. The cubic root of 1387357240 is about 1115.3112981205.

The spelling of 1387357240 in words is "one billion, three hundred eighty-seven million, three hundred fifty-seven thousand, two hundred forty".