1387220731 has 8 divisors (see below), whose sum is σ = 1498005824. Its totient is φ = 1277017920.

The previous prime is 1387220717. The next prime is 1387220753. The reversal of 1387220731 is 1370227831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1387220731 - 2¹³ = 1387212539 is a prime.

It is a super-2 number, since 2×1387220731² = 3848762713032348722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387220711) 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, 140610 + ... + 150151.

It is an arithmetic number, because the mean of its divisors is an integer number (187250728).

Almost surely, 2^1387220731 is an apocalyptic number.

1387220731 is a deficient number, since it is larger than the sum of its proper divisors (110785093).

1387220731 is a wasteful number, since it uses less digits than its factorization.

1387220731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291141.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 1387220731 is about 37245.4122141238. The cubic root of 1387220731 is about 1115.2747165731.

The spelling of 1387220731 in words is "one billion, three hundred eighty-seven million, two hundred twenty thousand, seven hundred thirty-one".