42047640 has 64 divisors (see below), whose sum is σ = 140162400. Its totient is φ = 11212416.

The previous prime is 42047633. The next prime is 42047653. The reversal of 42047640 is 4674024.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18387 + ... + 20546.

Almost surely, 2^42047640 is an apocalyptic number.

42047640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42047640 is an abundant number, since it is smaller than the sum of its proper divisors (98114760).

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

42047640 is a wasteful number, since it uses less digits than its factorization.

42047640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38953 (or 38943 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 42047640 is about 6484.4151625262. The cubic root of 42047640 is about 347.7340417402.

The spelling of 42047640 in words is "forty-two million, forty-seven thousand, six hundred forty".