1390787801 has 8 divisors (see below), whose sum is σ = 1498400904. Its totient is φ = 1283264640.

The previous prime is 1390787791. The next prime is 1390787803. The reversal of 1390787801 is 1087870931.

It can be written as a sum of positive squares in 4 ways, for example, as 58537801 + 1332250000 = 7651^2 + 36500^2 .

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 1390787801 - 2²² = 1386593497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1390787803) 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, 11555 + ... + 53991.

It is an arithmetic number, because the mean of its divisors is an integer number (187300113).

Almost surely, 2^1390787801 is an apocalyptic number.

It is an amenable number.

1390787801 is a deficient number, since it is larger than the sum of its proper divisors (107613103).

1390787801 is a wasteful number, since it uses less digits than its factorization.

1390787801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44971.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 1390787801 is about 37293.2675023254. The cubic root of 1390787801 is about 1116.2298296476.

The spelling of 1390787801 in words is "one billion, three hundred ninety million, seven hundred eighty-seven thousand, eight hundred one".