400112020 has 48 divisors (see below), whose sum is σ = 1047570048. Its totient is φ = 124709760.

The previous prime is 400111973. The next prime is 400112023. The reversal of 400112020 is 20211004.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 400111988 and 400112006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400112023) 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, 128367 + ... + 131446.

It is an arithmetic number, because the mean of its divisors is an integer number (21824376).

Almost surely, 2^400112020 is an apocalyptic number.

It is an amenable number.

400112020 is an abundant number, since it is smaller than the sum of its proper divisors (647458028).

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

400112020 is a wasteful number, since it uses less digits than its factorization.

400112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259840 (or 259838 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 400112020 is about 20002.8003039574. The cubic root of 400112020 is about 736.8750741765.

Adding to 400112020 its reverse (20211004), we get a palindrome (420323024).

The spelling of 400112020 in words is "four hundred million, one hundred twelve thousand, twenty".