1381802257 has 8 divisors (see below), whose sum is σ = 1572960960. Its totient is φ = 1201566960.

The previous prime is 1381802251. The next prime is 1381802267. The reversal of 1381802257 is 7522081831.

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

It is not a de Polignac number, because 1381802257 - 2¹⁵ = 1381769489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381802251) 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, 2730582 + ... + 2731087.

It is an arithmetic number, because the mean of its divisors is an integer number (196620120).

Almost surely, 2^1381802257 is an apocalyptic number.

It is an amenable number.

1381802257 is a deficient number, since it is larger than the sum of its proper divisors (191158703).

1381802257 is a wasteful number, since it uses less digits than its factorization.

1381802257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461703.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 1381802257 is about 37172.6008909788. The cubic root of 1381802257 is about 1113.8207368946.

The spelling of 1381802257 in words is "one billion, three hundred eighty-one million, eight hundred two thousand, two hundred fifty-seven".