1401939257 has 8 divisors (see below), whose sum is σ = 1497066240. Its totient is φ = 1309931280.

The previous prime is 1401939241. The next prime is 1401939269. The reversal of 1401939257 is 7529391041.

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 1401939257 - 2⁴ = 1401939241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1401939457) 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, 778823 + ... + 780620.

It is an arithmetic number, because the mean of its divisors is an integer number (187133280).

Almost surely, 2^1401939257 is an apocalyptic number.

It is an amenable number.

1401939257 is a deficient number, since it is larger than the sum of its proper divisors (95126983).

1401939257 is a wasteful number, since it uses less digits than its factorization.

1401939257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559503.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 1401939257 is about 37442.4793116054. The cubic root of 1401939257 is about 1119.2052336166.

The spelling of 1401939257 in words is "one billion, four hundred one million, nine hundred thirty-nine thousand, two hundred fifty-seven".