400722040 has 32 divisors (see below), whose sum is σ = 906313680. Its totient is φ = 159455232.

The previous prime is 400722019. The next prime is 400722043. The reversal of 400722040 is 40227004.

It is a junction number, because it is equal to n+sod(n) for n = 400721999 and 400722017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400722043) 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, 18234 + ... + 33673.

Almost surely, 2^400722040 is an apocalyptic number.

400722040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400722040 is an abundant number, since it is smaller than the sum of its proper divisors (505591640).

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

400722040 is a wasteful number, since it uses less digits than its factorization.

400722040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52111 (or 52107 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 400722040 is about 20018.0428613788. The cubic root of 400722040 is about 737.2493695903.

Adding to 400722040 its reverse (40227004), we get a palindrome (440949044).

The spelling of 400722040 in words is "four hundred million, seven hundred twenty-two thousand, forty".