1391137390 has 8 divisors (see below), whose sum is σ = 2504047320. Its totient is φ = 556454952.

The previous prime is 1391137379. The next prime is 1391137393. The reversal of 1391137390 is 937311931.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391137393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69556860 + ... + 69556879.

It is an arithmetic number, because the mean of its divisors is an integer number (313005915).

Almost surely, 2^1391137390 is an apocalyptic number.

1391137390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1391137390 is a deficient number, since it is larger than the sum of its proper divisors (1112909930).

1391137390 is a wasteful number, since it uses less digits than its factorization.

1391137390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139113746.

The product of its (nonzero) digits is 15309, while the sum is 37.

The square root of 1391137390 is about 37297.9542334429. The cubic root of 1391137390 is about 1116.3233471439.

The spelling of 1391137390 in words is "one billion, three hundred ninety-one million, one hundred thirty-seven thousand, three hundred ninety".