740856397 has 4 divisors (see below), whose sum is σ = 743610780. Its totient is φ = 738102016.

The previous prime is 740856343. The next prime is 740856409. The reversal of 740856397 is 793658047.

It is a happy number.

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 425225641 + 315630756 = 20621^2 + 17766^2 .

It is a cyclic number.

It is not a de Polignac number, because 740856397 - 2¹¹ = 740854349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 740856397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (740856307) 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, 1376788 + ... + 1377325.

It is an arithmetic number, because the mean of its divisors is an integer number (185902695).

Almost surely, 2^740856397 is an apocalyptic number.

It is an amenable number.

740856397 is a deficient number, since it is larger than the sum of its proper divisors (2754383).

740856397 is a wasteful number, since it uses less digits than its factorization.

740856397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754382.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 740856397 is about 27218.6773558158. The cubic root of 740856397 is about 904.8529606558.

The spelling of 740856397 in words is "seven hundred forty million, eight hundred fifty-six thousand, three hundred ninety-seven".