101440542 has 32 divisors (see below), whose sum is σ = 232284672. Its totient is φ = 28930464.

The previous prime is 101440489. The next prime is 101440543. The reversal of 101440542 is 245044101.

It is a happy number.

It is a super-2 number, since 2×101440542² = 20580367122507528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101440543) 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, 25308 + ... + 29040.

It is an arithmetic number, because the mean of its divisors is an integer number (7258896).

Almost surely, 2^101440542 is an apocalyptic number.

101440542 is an abundant number, since it is smaller than the sum of its proper divisors (130844130).

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

101440542 is a wasteful number, since it uses less digits than its factorization.

101440542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 101440542 is about 10071.7695565377. The cubic root of 101440542 is about 466.3770671457.

Adding to 101440542 its reverse (245044101), we get a palindrome (346484643).

The spelling of 101440542 in words is "one hundred one million, four hundred forty thousand, five hundred forty-two".