726401957 has 4 divisors (see below), whose sum is σ = 727991916. Its totient is φ = 724812000.

The previous prime is 726401927. The next prime is 726401981. The reversal of 726401957 is 759104627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 275858881 + 450543076 = 16609^2 + 21226^2 .

It is a cyclic number.

It is not a de Polignac number, because 726401957 - 2¹⁶ = 726336421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726401927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794294 + ... + 795207.

It is an arithmetic number, because the mean of its divisors is an integer number (181997979).

Almost surely, 2^726401957 is an apocalyptic number.

It is an amenable number.

726401957 is a deficient number, since it is larger than the sum of its proper divisors (1589959).

726401957 is a wasteful number, since it uses less digits than its factorization.

726401957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589958.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 726401957 is about 26951.8451501933. The cubic root of 726401957 is about 898.9295738823.

The spelling of 726401957 in words is "seven hundred twenty-six million, four hundred one thousand, nine hundred fifty-seven".