1401207857 has 4 divisors (see below), whose sum is σ = 1601380416. Its totient is φ = 1201035300.

The previous prime is 1401207823. The next prime is 1401207859. The reversal of 1401207857 is 7587021041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7587021041 = 2267 ⋅3346723.

It is a cyclic number.

It is not a de Polignac number, because 1401207857 - 2⁶ = 1401207793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1401207859) 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, 100086269 + ... + 100086282.

It is an arithmetic number, because the mean of its divisors is an integer number (400345104).

Almost surely, 2^1401207857 is an apocalyptic number.

It is an amenable number.

1401207857 is a deficient number, since it is larger than the sum of its proper divisors (200172559).

1401207857 is an equidigital number, since it uses as much as digits as its factorization.

1401207857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200172558.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 1401207857 is about 37432.7110559735. The cubic root of 1401207857 is about 1119.0105677638.

Adding to 1401207857 its reverse (7587021041), we get a palindrome (8988228898).

The spelling of 1401207857 in words is "one billion, four hundred one million, two hundred seven thousand, eight hundred fifty-seven".