407028997 has 4 divisors (see below), whose sum is σ = 408718156. Its totient is φ = 405339840.

The previous prime is 407028991. The next prime is 407029003. The reversal of 407028997 is 799820704.

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

It is an interprime number because it is at equal distance from previous prime (407028991) and next prime (407029003).

It can be written as a sum of positive squares in 2 ways, for example, as 122567041 + 284461956 = 11071^2 + 16866^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-407028997 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 (407028991) 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, 844218 + ... + 844699.

It is an arithmetic number, because the mean of its divisors is an integer number (102179539).

Almost surely, 2^407028997 is an apocalyptic number.

It is an amenable number.

407028997 is a deficient number, since it is larger than the sum of its proper divisors (1689159).

407028997 is a wasteful number, since it uses less digits than its factorization.

407028997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689158.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 407028997 is about 20174.9596529956. The cubic root of 407028997 is about 741.0971047002.

The spelling of 407028997 in words is "four hundred seven million, twenty-eight thousand, nine hundred ninety-seven".