731406340 has 48 divisors (see below), whose sum is σ = 1791216000. Its totient is φ = 250765536.

The previous prime is 731406329. The next prime is 731406341. The reversal of 731406340 is 43604137.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 731406299 and 731406308.

It is not an unprimeable number, because it can be changed into a prime (731406341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46450 + ... + 60169.

It is an arithmetic number, because the mean of its divisors is an integer number (37317000).

Almost surely, 2^731406340 is an apocalyptic number.

731406340 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

731406340 is an abundant number, since it is smaller than the sum of its proper divisors (1059809660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

731406340 is a wasteful number, since it uses less digits than its factorization.

731406340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106649 (or 106633 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 731406340 is about 27044.5251391109. The cubic root of 731406340 is about 900.9891757887.

The spelling of 731406340 in words is "seven hundred thirty-one million, four hundred six thousand, three hundred forty".